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题目列表(包括答案和解析)

阅读短文，选择正确答案。

      Mobile phone has become a problem for high schools. Some high-school students in Australia are not
allowed to carry mobile phones during school hours.
      Mobile phone used among children has become a problem for the school years. Several children have got
mobile phones as Christmas presents, and more students will want them. Marry Brown, a headmaster, said that
mobile phone was a distraction (分心事) to students during school hours and it also gave teachers so much
trouble in their classrooms. Teachers were also saying that sometimes students might use phone messages to
cheat during exams.
      She said some schools had tried to ban (禁止) mobile phones. 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 there was a good reason that they
could leave their phones at school offices. They also said they were easily lost and were a distraction for 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 high schools in Australia have stopped students from carrying mobile phones _____.

[ ]

A. because they are students
B. when they are free
C. when they are at school
D. because they are children

2. What does the word "cheat" mean in Chinese in this passage?

[ ]

A. 聊天
B. 核对
C. 查询
D. 作弊

3. Some children get mobile phones from _____ as presents.

[ ]

A. the makers and sellers
B. the teachers and strangers
C. their parents and friends
D. some mobile phone users

4. Some parents felt unhappy because they couldn't _____ during school hours.

[ ]

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

5. The passage tells us that _____.

[ ]

A. students shouldn't have mobile phones at school
B. it is good to allow students to use mobile phones at school
C. some parents felt unhappy because they couldn't use their phones at home
D. parents should teach their children how to use mobile phones during school hours

查看答案和解析>>

根据短文内容选择最佳答案。

　　Mobile phone has become a problem for middle schools．Some middle schools in Australia have banned(禁止)students from carrying mobile phones during school hours．

　　Mobile phone use among children has become a problem for the school this year．Several children have got mobile phones as Christmas gifts．Teachers said mobile phone use is a distraction(分散注意力的事)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．

　　She said some schools had tried to ban mobile phones．Some parents felt unhappy because they couldn't get in touch with(与……联系)their children．

　　Many teachers said students should not have mobile phones at school, but if there was a good reason, they could leave their phones at school office．They also said there were many reasons why the students should not have mobile phones at school：the mobile phones 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 in Australia have banned students from carrying mobile phones ________．
[　　]
A．	because they are students
B．	when they are free
C．	when they are at school
D．	because they are children

(2)

We know from the passage that some children get mobile phones from ________
[　　]
A．	the makers and sellers
B．	the passers-by and strangers
C．	their parents and friends
D．	some mobile phones users

(3)

What does the underlined word“cheat”mean in the passage?________．
[　　]
A．	聊天
B．	核对
C．	查询
D．	作弊

(4)

Some parents felt unhappy because they couldn't ________ during school hours．
[　　]
A．	use their mobile phones
B．	leave their mobile phones at school office
C．	help the teachers with their work
D．	get in touch with their children

(5)

The passage tells us that ________．
[　　]
A．	students shouldn't have mobile phones at school except for some special reasons
B．	it is impossible to ban students from using mobile phones at school
C．	some parents felt unhappy because they couldn't use their phones at school
D．	parents should teach their children how to use mobile phones during school hours

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（10分）生长素的主要作用是促进细胞纵向伸长，其作用机理如图所示，请回答下列问题：

（1）生长素作用的第一步是与细胞膜上的受体结合，形成“激素—受体复合物”，这一过程体现了细胞膜的_________功能。
（2）被激活的“激素—受体复合物”能引起内质网释放Ca^{2 +} , Ca^{2 +}促使细胞内的 H⁺以的方式运往细胞外，增加了细胞壁的延展性，使细胞壁对细胞的压力减小，导致细胞吸水、体积增大而发生不可逆增长。细胞在生长过程中体积变化最大的细胞器是________。实验发现，细胞在持续生长过程中，细胞壁的厚度能基本保持不变，出现这种现象的原因是由于_____________（填细胞器）为细胞壁添加了新的成分。
（3） Ca^{2 +}还能激活细胞中的转录因子，它进入细胞核后，能引起____酶催化 mRNA 的合成。
（4）生长素促进根系生长的最适宜浓度要比茎低得多，稍高浓度的生长素能促进乙烯的生物合成，从而抑制了根的伸长，这说明生长素的作用具有__________。
（5）科学家研究发现紫外线可以抑制植物生长，原因是紫外线增加了植物体内吲哚乙酸氧化酶的活性，从而促进了生长素氧化为3—亚甲基氧代吲哚，而后者没有促进细胞伸长的作用。现在提供生长状况相同的健康的小麦幼苗若干作为实验材料，请完成下列实验方案，以验证紫外线抑制植物生长与生长素的氧化有关。
步骤 1 ：将小麦幼苗平均分为甲组和乙组。
步骤 2 ：给予甲组适宜的可见光光照，给予乙组_______________________光照。
步骤 3 ：观察两组幼苗的________________，并测量___________的含量。
预测实验结果： ______________________________________________________。

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阅读理解：先阅读短文，然后根据短文内容从文后每小题的四个选项中，选出一个能完成所给句子或回答所提问题的正确答案。

　　Mobile phone (手机) has become a problem for middle schools. Some middle schools in Australia have banned(禁止)students from carrying mobile phones during school hours.

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

　　Mary Bluett, an official, said mobile phone use is a distraction(分心的事) 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.

　　She said some schools had tried to ban mobile phones. 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 there was a good reason, they could leave their phones at school office. 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 in Australia have banned students from carrying mobile phones ________.

[　　]

A．because they are students

B．when they are free

C．when they are at school

D．because they are children

2．We know from the passage that some children get mobile phones from ________.

[　　]

A．the makers and sellers

B．the passers-by and strangers

C．their parents and friends

D．some mobile phone users

3．What does the underlined word cheat mean in the passage?

[　　]

A．聊天

B．核对

C．查询

D．作弊

4．Some parents felt unhappy because they couldn't ________ during school hours.

[　　]

A．use their mobile phones

B．leave their mobile phones at school office

C．help the teachers with their work

D．get in touch with their children

5．The passage tells us that ________.

[　　]

A．students shouldn't have mobile phones at school except for some special reasons

B．it is impossible to ban students from using mobile phone at school

C．some parents felt unhappy because they couldn't use their phones at school

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

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