问题 阅读理解

阅读理解。

     Dogs like living with people. A dog can be a best friend. He will do a lot of things for people. Some dogs

help people to look after sheep,and others help them to find the lost,things. And some of the dogs can help the

blind (瞎的,盲的) men or women do things.

     Many years ago there was a very good dog. His name was Seeing Eye dog. Now we can see this kind of

dogs all over the world. They are working for the blind.

    The Seeing Eye dog is strong,good and easy to train (训练). He helps the blind to walk from place to place.

     Before a dog becomes a Seeing Eye dog, he must go to a training school for about three months. First the

dog has to learn to sit or stay when he hears the trainer's call. In his next lesson the dog learns to take his

trainer across busy street.

     The dog has many things to learn. And in every lesson he must learn to do one thing again and again for

many times.

    At the end of the training school he must take tests (测试). When he passes the final test, the Seeing Eye

dog is ready (准备好) to do things by himself.

     Now he is ready to help a blind person. The new master (主人) may be a man, a woman, or even a child.

It takes the dog and his blind master about a month to learn to work and live together.

1. We can see the Seeing Eye dog _____.

A. only in the China

B. only in a small city

C. all over the world

D. all over the USA.

2. The Seeing Eye dog helps _____ to walk from place to place.

A. the police

B. the teachers

C. the blind

D. the masters

3. If you want a dog to become a Seeing Eye dog, you must let him _____.

A. go to the USA

B. go to a training school

C. go across the streets

D. go to an English school.

4. First the dog has to learn to sit or stay _____.

A. when he hears the telephone.

B. when he hears the teacher's call

C. when he hears the trainer's call.

D. when he hears the barking (叫) of other dogs.

5. It takes the dog and his master _____ to learn to work and live together.

A. three mouths

B. five weeks

C. about a month

D. about a week

答案

1-5      CCBCC

实验题

“化学反应条件的控制是实验灵魂”。某校化学兴趣小组在老师指导下,进行了“影响双氧水分解因素”的实验。请你帮助回答下列问题。

(1)取两支大试管,分别倒入适量的6%、15%的双氧水,再加入等量的MnO2,各收集一小试管气体,发现浓度大的先收集满。该操作过程中合理的排列顺序是__________(选填序号)。

①检验装置的气密性

②待有连续稳定气泡再排水集气

③将水槽中待收集气体的小试管注满水

④旋紧连有导管的单孔胶塞

⑤向大试管内倒入适量双氧水再加入少许MnO2粉末

(2)用试管进行排水法集气时,主要出现了如下图示所示的4种操作,其中合理的是___________(此小题为不定项选择填空,多选,错选不给分) 。

(3)取a 、b两支试管加入等体积6%的双氧水,再分别加入少许MnO2粉末、CuO粉末,发现a 中比b中产生气泡多且快。随即用带火星的木条分别悬空伸入试管内,发现a中火星复燃,b中火星仅发亮但不复燃。由此得出影响双氧水分解的因素是_______________。

(4)再取一支试管倒入适量6%的双氧水,仔细观察溶液内有少量细小气泡浮起;然后将该支试管浸入约80℃的热水中,溶液内气泡明显增多。这时将带火星的木条悬空伸入试管内,却不能复燃。试对比第(3)题a 中火星复燃的现象,分析两者现象差异的根本原因是________________。

单项选择题