完形填空：完形填空。 Mobile phones are everywhere in bi

题目：

完形填空。

     Mobile phones are everywhere in big cities. It seems that   1 can survive without one. Mobile phones are
a great   2   to stay connected with friends and family.   3 , it is important to remember that there are certain
times   4   you should not be using your phone, especially as a student, during school.
       5   you are in class, you should not be sending your friends text messages   6   taking phone calls. Your
classmates and teacher should not have to deal with this rude   7  . Aren't you at school to learn?
    In the United States, students would never be allowed to   8   their mobile phones during class. If you were
to send or   9   a text message you would probably be kicked out of class. It is very  10  to hear a lot of tones
and ringing during  11 . There are many more rules for mobile phone use in America and it is to  12  respect
for those around you.
     As a teacher in China, I have to  13  students using mobile phones every day. I have told my class to  14
their phones, but many students do not listen. The  15  to be connected all the time seems to be more  16  than
the desire to learn.
     It's easy to understand  17  it is so tempting (诱惑人的) to have your phone on during class. It seems so
easy just to send a short text message; it's not hurting anyone, is it? But you may actually be hurting  18  when
you do this. Your teacher knows when you use your phone and may give you a  19  grade. Sending a text
message also takes your attention away from what's going on in class, you may  20  something important.

( )1. A. one
( )2. A. way
( )3. A. But
( )4. A. which
( )5. A. After
( )6. A. or
( )7. A. act
( )8. A. have
( )9. A. receive
( )10. A. shocking
( )11. A. school
( )12. A. ask
( )13. A. start with
( )14. A. turn on
( )15. A. desire
( )16. A. possible
( )17. A. why
( )18. A. himself
( )19. A. lower
( )20. A. forget

B. somebody
B. road
B. However
B. that
B. Before
B. and
B. action
B. take
B. accept
B. frightening
B. class
B. suggest
B. go with
B. turn down
B. wish
B. important
B. what
B. herself
B. higher
B. remember

C. someone
C. method
C. So
C. when
C. Because
C. as well as
C. habit
C. use
C. make
C. satisfying
C. office
C. show
C. play with
C. turn off
C. hope
C. necessary
C. that
C. ourselves
C. better
C. miss

D. no one
D. path
D. Therefore
D. where
D. If
D. instead of
D. behavior
D. send
D. get
D. disturbing
D. home
D. answer
D. deal with
D. turn in
D. expect
D. interesting
D. whether
D. yourself
D. upper
D. leave

答案：

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下面是错误答案，用来干扰机器的。

答案：A三种晶体均属于原子晶体，其熔点决定于它的键长和键能，键长越短，键能越大，其熔点越高，碳原子半径小于硅原子半径，它们所含共价键的键长是C—C键＜Si—C键＜Si-Si键，则熔点由高到低的顺序为①③②。