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题目列表(包括答案和解析)

There are 47 different ___1___ 0f kangaroos(袋鼠).The smallest are about a quarter(四之一)of a meter longthe biggest(最大的)are taller(比高)than a man.

They are used(用来)for jumping. They also have long strong tails(尾巴)used for resting on. Kangaroos’ front legs are much shorter, and are almost ___3___ arms. Kangaroos' heads are quit e small, but their ears are  ___4___.Mother kangaroos have a pocket at the front. They have ___5___ baby each year. When it is born, the baby kangaroos goes. straight ___6___ its mother's pocket. The baby kangaroos stay there ___7___ six months. The biggest kangaroos stand more than 2 meters ___8___ ,and their legs are so strong that they can ___9___ more than 9 meters. They are very fast, and can travel at more than 50 kilometers an hour. They are very strong, but only ___10___ fruit, leaves and grass.

1. ( )

A. ways              B. kinds

C. animals              D. colors

2. ( )

A. has              B. there are

C. use              D. have

3. ( )

A.1ike              B. 1ikes

C. have              D. big

4. ( )

A. quite small          B. quite large

C. very Small          D. not big

5. ( )

A. one              B. pocket

C. arm              D. kangaroos

6. ( )

A. on              B. into

C. up              D. out

7. ( )

A. in              B. for

C. all              D. after

8. ( )

A. small              B. big

C. long              D. tall

9. ( )

A. fly              B. run

C. jump              D. walk

10. ( )

A. drink              B. eat

C. pick              D. play with

 

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______ all the students, he is the tallest (tall 高的).

[    ]

  A. In   B. On   C. Of   D. To

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阅读理解

This is No12 High SchoolMy friend Dongdong is in this schoolDongdong has short hair, a big nose, a small mouth and big eyesHe is thirteenHe is in Class Two, Grade SevenHe's a good studentHe has two good friends in his schoolThey are Jim and JackThey’re brothers(兄弟)They are fourteenThey have small noses, small eyes, but they’re very tall(高的)Jim, Jack and Dongdong are in the same classMrLee is their(他们的)teacherThey are good friends

根据短文内容,选择正确答案。

(1)

Dongdong is in ________

[  ]

A.

No2 High School

B.

Class 7, Grade 2

C.

Class 2, Grade 7

D.

Class 2, Grade 8

(2)

How old is Dongdong? He is ________

[  ]

A.

fourteen

B.

thirteen

C.

twelve

D.

eleven

(3)

MrLee is ________

[  ]

A.

Jack's brother

B.

Dongdong's brother

C.

Dongdong's teacher

D.

Jin's brother

(4)

Jim, Jack and Dongdong are in ________ school

[  ]

A.

same

B.

some

C.

different

D.

the same

(5)

Who has big eyes?

[  ]

A.

Jim

B.

Dongdong

C.

MrLee

D.

Jack

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(10分)植物具有向重力生长的特性,下列是研究根向重力生长机理的两个实验。
实验一:将空白琼脂和含EDTA的琼脂做成帽状,分别套在甲、乙两组玉米胚根的根冠外(示意图如下)。提示:EDTA的作用是去除与其临接部位的 Ca2+

将胚根水平放置培养一定时间后,观察到甲组胚根向重力(下)生长,乙组胚根水平生长。根据上述实验结果,得出实验结论:                               
  实验二:水平放置的胚根弯曲向下生长,与根冠近地侧的Ca2+浓度明显高于远地侧有关。研究表明,根总是朝着Ca 2+浓度高的方向弯曲生长。为验证这一结论,有人设计了下列实验方案。请根据提供的实验材料和用具,写出第二步及以后的实验步骤和实验结果,并回答问题。
(1)实验材料和用具:胚根等长的萌发玉米种子,空白琼脂帽,含EDTA的琼脂帽,上面部分含Ca2+的琼脂帽(水平方向),培养皿等。
(2)实验步骤:
  第一步:取若干个培养皿,在每个培养皿中放置适量的萌发玉米种子,按实验一中乙组的方法处理胚根一定时间后,移去根冠外的琼脂帽。然后将培养皿平均分成两组,编号为 A组、B 组。 
  第二步:                                                            
  第三步:                                                            
(3)实验结果:                                                         
(4)科学家进一步证实,根冠中生长素的分布受Ca2+浓度影响,当胚根水平放置时,重力诱导Ca2+向根冠下侧移动,导致近地侧的生长素浓度比远地侧高。请分析胚根的生长素分布与向重力生长的关系:                                  

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选用放框中的词填空,使短文意思完整、正确

Jeff Black is our new  1  teacher.He will teache us for one  2  .He  3  from Canada.He is about thirty.He is smart and tall.His  4  is brown and he has blue  5  .He likes to  6  T-shirts.Mr Black  7  English well.He always makes the class interesting and we  8  his classes very much.Mr Black  9  us and we love him,  10  

1.________  2.________  3.________  4.________  5.________

6.________  7.________  8.________  9.________  10.________

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