根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

It’s summertime-time once again for mosquitoes to make their appearance. And once they appear, mosquitoes are a total pain. They land on you,  bite you, suck out some blood and leave behind an itchy welt（发痒的红肿）.

  1  Female mosquitoes must find blood in order to reproduce, so mosquitoes come equipped with finely tuned sensors to help them locate the blood they need.

Mosquitoes’ weapons

Mosquitoes have perfected three different types of sensors. First, mosquitoes can sense several different chemicals. Mosquitoes can smell carbon dioxide and lactic acid（乳酸）up to 100 feet away.   2 

Second, mosquitoes have very good eyesight. If you are wearing clothing that contrasts with the background, and if you move while wearing that clothing, mosquitoes can see you. It’s a good bet that anything moving is alive, and therefore full of blood.

Finally, mosquitoes come equipped with temperature sensors, so they can find warm-blood mammals and birds very easily.

  3  The female mosquito sticks her proboscis（喙）into you. She sucks about five microliters of your blood into her abdomen.

After she has bitten you, some saliva（唾液）remains in the wound.   4  The area swells and you tich. Eventually, the selling goes away, but the itch remains until your immune cells break down the saliva proteins.

Our defense methods

Because mosquitoes are both a nuisance（讨厌的东西） and a danger, people prefer to stay away from mosquitoes. One way to do that is to use a chemical called DEET, which seems to black a mosquito’s chemical sensors.   5  In some cities there are even trucks that drive around town to spray for mosquitoes. Finally there are to traps. The most popular traps turn propane（丙烷） into carbon dioxide and warmth to attract mosquitoes. Over time, by catching large numbers of mosquitoes, these traps can cause the collapse of the mosquito population in the area.

A．Another way to control mosquitoes is with insecticides（杀虫剂） that kill them.

B．How mosquitoes work is unknown to most of us.

C．Once a mosquito lands on you, it is time to bite.

D．Some bites of mosquitoes are more serious than you thought.

E. Mammals and birds give off these gases as part of their normal breathing.

F. The proteins from the saliva create an immune response from your body.

G. But if you ignore the fact that mosquitoes are so annoying they really are amazing.

 

Do you want to have a mobile phone? Have you had a mobile phone already? Nowadays more and more students have their own mobile phones, and mobile phone use has become a problem for middle schools. Some middle schools in China have banned students from carrying mobile phones during school hours.

Mobile phone use among children has become a big problem for the school this year. Some children have got mobile phones as birthday gifts, and more students want them.

Wang Pi, an official, said, “Mobile phone use is a distraction (分散注意力的东西) to students during school hours and it also gives teachers so much trouble in their classrooms.” Teachers were also saying that sometimes students might use phone messages to cheat during exams.

Wang Pialso said some schools had tried to ban mobile phones, but some parents felt unhappy because they couldn’t get in touch with their children.

Many teachers said students should not have mobile phones at school, but if their was a good reason, they could leave their phones at school offices. They also said there were many reasons why the students should not have mobile phones at school. They were easy to lose and were a distraction from studies.

Many people say that they understand why parents would want their children to have phones, but they think schools should let the students know when they can use their mobile phones.

1.Some middle schools have banned students from carrying mobile phones         .

A．because they are students	B．because they don’t earn money
C．when they are at school	D．when they are free

2.Some parents felt unhappy because they couldn’t        during school hours.

A．help the teachers with their work	B．leave their mobile phones at school offices
C．use their mobile phones	D．get in touch with their children

3.The three underlined words “they” in Para. 5 refer to       .

A．teachers; students; mobile phones	B．teachers; mobile phones; students
C．students; teachers; mobile phones	D．students; mobile phones; teachers

4.The passage tells us that         .

A．it is impossible to ban students from using mobile phones at school

B．some parents felt unhappy because they couldn’t use their phones at school

C．students shouldn’t have mobile phones at school except for some special reasons

D．parents should teach their children how to use mobile phones during school hours

 

Do you want to have a mobile phone? Have you had a mobile phone already? Nowadays more and more students have their own mobile phones, and mobile phone use has become a problem for middle schools. Some middle schools in China have banned students from carrying mobile phones during school hours.

Mobile phone use among children has become a big problem for the school this year. Some children have got mobile phones as birthday gifts, and more students want them.

Wang Pi, an official, said, “Mobile phone use is a distraction (分散注意力的东西) to students during school hours and it also gives teachers so much trouble in their classrooms.” Teachers were also saying that sometimes students might use phone messages to cheat during exams.

Wang Pialso said some schools had tried to ban mobile phones, but some parents felt unhappy because they couldn’t get in touch with their children.

Many teachers said students should not have mobile phones at school, but if their was a good reason, they could leave their phones at school offices. They also said there were many reasons why the students should not have mobile phones at school. They were easy to lose and were a distraction from studies.

Many people say that they understand why parents would want their children to have phones, but they think schools should let the students know when they can use their mobile phones.

Some middle schools have banned students from carrying mobile phones         .

      A．because they are students B．because they don’t earn money

       C．when they are at school   D．when they are free

Some parents felt unhappy because they couldn’t        during school hours.

       A．help the teachers with their work    B．leave their mobile phones at school offices

       C．use their mobile phones   D．get in touch with their children

The three underlined words “they” in Para. 5 refer to       .

       A．teachers; students; mobile phones   B．teachers; mobile phones; students

       C．students; teachers; mobile phones   D．students; mobile phones; teachers

The passage tells us that         .

      A．it is impossible to ban students from using mobile phones at school

       B．some parents felt unhappy because they couldn’t use their phones at school

       C．students shouldn’t have mobile phones at school except for some special reasons

       D．parents should teach their children how to use mobile phones during school hours

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
It’s summertime-time once again for mosquitoes to make their appearance. And once they appear, mosquitoes are a total pain. They land on you,  bite you, suck out some blood and leave behind an itchy welt（发痒的红肿）.
  1  Female mosquitoes must find blood in order to reproduce, so mosquitoes come equipped with finely tuned sensors to help them locate the blood they need.
Mosquitoes’ weapons
Mosquitoes have perfected three different types of sensors. First, mosquitoes can sense several different chemicals. Mosquitoes can smell carbon dioxide and lactic acid（乳酸）up to 100 feet away.   2 
Second, mosquitoes have very good eyesight. If you are wearing clothing that contrasts with the background, and if you move while wearing that clothing, mosquitoes can see you. It’s a good bet that anything moving is alive, and therefore full of blood.
Finally, mosquitoes come equipped with temperature sensors, so they can find warm-blood mammals and birds very easily.
  3  The female mosquito sticks her proboscis（喙）into you. She sucks about five microliters of your blood into her abdomen.
After she has bitten you, some saliva（唾液）remains in the wound.   4  The area swells and you tich. Eventually, the selling goes away, but the itch remains until your immune cells break down the saliva proteins.
Our defense methods
Because mosquitoes are both a nuisance（讨厌的东西） and a danger, people prefer to stay away from mosquitoes. One way to do that is to use a chemical called DEET, which seems to black a mosquito’s chemical sensors.   5  In some cities there are even trucks that drive around town to spray for mosquitoes. Finally there are to traps. The most popular traps turn propane（丙烷） into carbon dioxide and warmth to attract mosquitoes. Over time, by catching large numbers of mosquitoes, these traps can cause the collapse of the mosquito population in the area.

A．Another way to control mosquitoes is with insecticides（杀虫剂） that kill them.

B．How mosquitoes work is unknown to most of us.

C．Once a mosquito lands on you, it is time to bite.

D．Some bites of mosquitoes are more serious than you thought.

E. Mammals and birds give off these gases as part of their normal breathing.
F. The proteins from the saliva create an immune response from your body.
G. But if you ignore the fact that mosquitoes are so annoying they really are amazing.

Do you want to have a mobile phone? Have you had a mobile phone already? Nowadays more and more students have their own mobile phones, and mobile phone use has become a problem for middle schools. Some middle schools in China have banned students from carrying mobile phones during school hours.
Mobile phone use among children has become a big problem for the school this year. Some children have got mobile phones as birthday gifts, and more students want them.
Wang Pi, an official, said, “Mobile phone use is a distraction (分散注意力的东西) to students during school hours and it also gives teachers so much trouble in their classrooms.” Teachers were also saying that sometimes students might use phone messages to cheat during exams.
Wang Pialso said some schools had tried to ban mobile phones, but some parents felt unhappy because they couldn’t get in touch with their children.
Many teachers said students should not have mobile phones at school, but if their was a good reason, they could leave their phones at school offices. They also said there were many reasons why the students should not have mobile phones at school. They were easy to lose and were a distraction from studies.
Many people say that they understand why parents would want their children to have phones, but they think schools should let the students know when they can use their mobile phones.
【小题1】Some middle schools have banned students from carrying mobile phones         .

A．because they are students	B．because they don’t earn money
C．when they are at school	D．when they are free

【小题2】Some parents felt unhappy because they couldn’t        during school hours.

A．help the teachers with their work	B．leave their mobile phones at school offices
C．use their mobile phones	D．get in touch with their children

【小题3】The three underlined words “they” in Para. 5 refer to       .

A．teachers; students; mobile phones	B．teachers; mobile phones; students
C．students; teachers; mobile phones	D．students; mobile phones; teachers

【小题4】The passage tells us that         .

A．it is impossible to ban students from using mobile phones at school

B．some parents felt unhappy because they couldn’t use their phones at school

C．students shouldn’t have mobile phones at school except for some special reasons

D．parents should teach their children how to use mobile phones during school hours