Question

求答案！谢谢！

一、单选题（共 50 道试题，共 100 分。）V 1. He is ____ on going to American to continue his studies.
A. intention
B. intend
C. intent
D. intense
满分：2 分
2. It is a ____ time to wait for the result of the exam.
A. trying
B. tried
C. difficult
D. worrying
满分：2 分
3. She ( ) in America for many years. She hopes to go back to China next year.
A. lives
B. lived
C. has lived
满分：2 分
4. They ( ) him for the job because he is a good teacher.
A. recommended
B. introduced
C. made
满分：2 分
5. She ( ) to town last week.
A. goes
B. went
C. has gone
满分：2 分
6. Mary ( ) the keys to her bedroom at last.
A. finds
B. find
C. found
满分：2 分
7. Xiao Wang ( ) a university student next year.
A. is
B. will be
C. is being
满分：2 分
8. While I ( ) the bus, it started to rain.
A. was waiting for
B. waited for
C. am waiting for
满分：2 分
9. A friend of mine is meeting me ( ).
A. in Friday
B. after Friday
C. on Friday
满分：2 分
10. The war broke out and killed many ____.
A. as a result
B. at last
C. in the end
D. therefore
满分：2 分
11. I ( ) football when I was young.
A. used to play
B. used to playing
C. used to be playing
满分：2 分
12. Mary spent the whole afternoon looking ( ) the shops.
A. for
B. round
C. up
满分：2 分
13. This cake is ( ) nice. I'd like to have more of it.
A. too
B. really
C. most
满分：2 分
14. The new English dictionary I bought yesterday ____ me almost twenty Yuan.
A. spent
B. paid
C. cost
D. took
满分：2 分
15. I’ve lived in Chongqing ( ) twenty years.
A. in
B. for
C. since
满分：2 分
16. ( ) was she dancing with? Her new boyfriend?
A. Who
B. What
C. Which
满分：2 分
17. Mike offered to help and so ( ) John.
A. does
B. is
C. did
满分：2 分
18. He ( ) to the hospital after the accident.
A. took
B. was taking
C. was taken
满分：2 分
19. I’m going to buy Mary a birthday gift. Do you have ( ) in mind?
A. special something
B. special anything
C. anything special
满分：2 分
20. Three books are interesting, but the rest ( ) not very good.
A. are
B. is
C. be
满分：2 分
21. Is it difficult to learn to ( ) Tai Chi?
A. do
B. play
C. go
满分：2 分
22. Richard works really hard, and ( ) you.
A. so do
B. so are
C. so did
满分：2 分
23. He ( ) a lot of money since he ( ) his own restaurant business.
A. made, has started
B. has made, started
C. have made, started
满分：2 分
24. They might tell him ( ) about their companies.
A. interesting something
B. something interesting
C. any interesting
满分：2 分
25. Do you want to add some milk ( ) your tea?
A. in
B. to
C. for
满分：2 分

Answer 1

(1)智慧数必须满足 x=a*a-b*b=(a+b)*(a-b);
28=2*14，解方程a=8,b=6;
2015=5*403，解方程a=204,b=199;
所以28和2015都是“智慧数”。
(2)正整数x都可以分解为x=x*1,则a=(x+1)/2,b=(x-1)/2。
如果x是正奇数，则a和b都是正整数。所以除1之外的正奇数一定是“智慧数”
请采纳。

Answer 2