Why is it the biggest challenge now to find ways to bring the satellites back to the earth
A. Because it is too hard.
Because there are no such scientists that can do so.
C. Because major highways of space junk could gradually increase as CubeSats become more common.
D. Because kids can't do that.
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Section A
Directions: This section is to test your ability to give proper answers to questions. There are 5 recorded questions in it. After each question, there is a pause. The questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D.
听力原文：It's sunny today．Why not go out for a picnic？
(1)
A. That's a wonderful idea.
B. We may go out.
C. Picnic is interesting.
D. I don't think so.
听力原文：Kate，thanks for your gift．
(3)
A. I am gifted.
B. I'm glad you like it.
C. No, thanks.
D. You are friendly to me.
Which statement is true according to the passage？ ______.
A. Mr. Johnson's car stood on its boot as it fell down.
B. Mr. Johnson could not escape from the door because it was full of sweet jam.
C. Mr. Johnson's car accident was partly due to the slippery road.
D. Mr. Johnson struggled in the pouring mud as he unscrewed the back seat.
According to the passage, all of the following were true of the center of the atom EXCEPT
A. had not yet been seen by the naked eye
B. contained elements that were positively charged
C. was very little larger than a molecule
D. followed experimentally determinable processes
E. was smaller than 1/125 millionth of an inch
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