题目内容
Why do we want to do experiments? We want to do experiments to find the answers 16 our questions or problems.
Sometimes we have questions 17 we’re just curious (好奇的) . When your dog is barking a lot 18 no one comes into your home,when flowers and grasses 19 in the sidewalk,or when you see birds 20 in the sky,your curiosity may get the better of you and you start 21 all kinds of questions. This may make you 22 to find those answers by doing experiments.
People also ask questions because there 23 serious problems. Disease,pollution,and earth warming are just 24 of them. Scientists try to find 25 to stop the diseases or the sources (根源) of other problems. The scientific methods help do this.
16. A. of B. to C. about D. on
17. A. because B. because of C.so D. since
18. A. and B. or C. but D. so
19. A. grow B. discover C. find D. fill
20. A. to fly B. flied C. fly D. flying
21. A. explaining B. speaking C. talking D. proving
22. A. try B. trying C. to try D. tried
23. A. is B. are C. has D. have
24. A. a few B. few C. a little D. little
25. A. articles B. conclusions C. medicines D. news
16. B the answer to the question“问题的答案”，为固定搭配。
17. A 因为好奇有时我们才有问题，后一句是前一句的原因。
18. C 前后分句之间为转折关系，用but连接。
19. A 花草应是“生长”在人行道上,grow意为“生长”。
20. D 此处意为“当你看见小鸟在天空飞翔时”。see sb./sth. doing为固定搭配，意为“看见某人/某物在做……”。
21. D 因为好奇，就要去证明这些问题。prove“证明”。
22. A make sb. do sth.“使/让某人做某事”，使役动词make后用省略to的不定式作宾补。
23. B 这里是there be句型，后面的名词为复数，所以这里用 are。
24. A 因为them指代problems,又表肯定意义，故用a few。
25. C 药物可阻止疾病。故选C。
培优好卷单元加期末卷系列答案Many kinds of birds live in the United States,but the number of the birds is becoming smaller every year. One of the leading reasons is the growing number of pet cats. By keeping your pet cats in your home,you can help give birds a better possible chance to live.
Of the 90 million pet cats in this country,about twothirds are allowed to go outside. It is said that these cats kill hundreds of millions of birds each year,as well as billions of small animals such as rabbits and field mice.
They can also bring illness to the animals that live in people’s yards (院子) ，further weakening the health of the natural populations.
Allowing pet cats to go outside is not just bad for birds and wildlife,it’s also bad for the cats themselves. Outdoor cats can get sick very easily. They are in danger of traffic and attacks (攻击) from other animals. In fact,outdoor cats usually don't live past the age of five,while indoor cats often live to be 17 or older.
Keep your pet cat inside!If you raise a young cat,it’s your duty to let it play inside.
Problem | The number of birds is becoming 1. ； at the same time, many pet cats are in 2. of traffic and attacks from other animals. |
Reason for the problem | Pet cats are 3. to go outside freely. |
What to do | People who 4. a young cat have the 5. to let it play in- side. |