冀教版九年级上册Unit 5 Look into ScienceLesson29配套练习（含答案）

Unit 5 Look into Science
Lesson 29　DNA—The Story of You
Ⅰ. 根据句意及所给提示填空。
1. Mr. Black has two ______________（孙女）. They are both students.
2. The two workers were told not to smoke in the building, but they refused to follow the _______ （指示）.
3. She __________ （重复）that she had been there before.
4. The old grandmother is telling her __________ （孙子）a story. The boy is listening carefully.
5. There are __________ （亿）of animals in the world.
Ⅱ. 单项选择。
6.Ben’s composition is almost perfect ____ several spelling mistakes.
A. but B. besides C. except D. except for
7. — Heather, sit close to me, and take a look at your mistakes.
— Well, my mistakes are closely ____ my carelessness.
A. related to B. compared to C. covered by D. filled with
8.—What do you think of the book
— ____, it is quite useful for a green hand who is not good at the computer.
A. In all B. In order C. In general D. In place
9. — ____will you do with the old books
— Oh, we are talking about ____ to make good use of them.
A. How; how B. How; what C. What; how D. What; what
10.Rome is an ancient city _____is full of places of interest.
A. where B. which C. who D.whose
Ⅲ. 连词成句。
11. twins, similar, the, have, do, interests
___________________________________
12. how, does, us, influence, it, strongly
___________________________________
13. help, can, identify, others, from, it, you
___________________________________.
14. patterns, parents’, repeats, the, from, DNA, it, your
_________________________________________.
15. DNA, complex, a, what, thing, is
___________________________________!
Ⅳ. 词语运用。
Most kids love sweets. Why When we have sweet foods, the sugar leaves good 16.________ (feel) with us, making us want more. In fact, all delicious foods do this, but sugar has 17. ________ especially strong power.
Early humans often 18. _________ (have) very little food, so our bodies learned to store（存储）a lot of sugar as fat. 19. _________ this way, we saved energy for when there was no food. But today, most people have more of it. So it may now be 20. _________ (harm) to our health.
It’s certain that we need to eat 21. _________ (little) sugar than before. The trouble is that, in today’s world, our foods are 22. _________ (fill) with sugar. 23. _________ our meals look better, large amounts（数量）of sugar are often added. To solve the problem 24. _________ (wise), we should take more exercise, 25. _________ (two) a week at least. And remember, next time you want some cookies, eat an apple instead.
参考答案：
一、granddaughters；instruction；repeated；grandson；billions
二、DACCB
三、Do the twins have similar interests；How does it strongly influence us；It can help identify you from others；It repeats the patterns from your parents' DNA；What a complex thing DNA is
四、feelings；an；had；In；harmful；less；filled；Although；wisely；twice