阅读理解。
Ms Liu taught physics in a middle school. Last month she explained to one of her classes about
sound, and she decided to test them. She said to them, "Now, I have a brother in London. If I was
calling him on the phone, and at the same time you were 75 feet way, listening to me from across the
street, which of you would hear what I said first, my brother or you? Why?"
The cleverest student answered at once, "Your brother, Ms Liu, because electricity (电) travels
faster than sound waves (波)."
"That's very good," Ms Liu answered. But then one of the girls, Gao Hui, raised her hand and said,
"I don't think so." "Your brother would hear you earlier because when it's eleven o'clock here, it's
only eight o'clock in London."
1. The class studied _______.
A. reason
B. sound
C. waves
D. electricity
2. Ms Liu asked the students ________.
A. who would first hear what she said
B. who was listening to her
C. who was in London
D. whose answer was right
3. Who would hear Ms Liu's words first?
A. Gao Hui.
B. The students 75 feet away.
C. They would hear the words at the same time.
D. Her brother.
4. The first student thought her brother heard the words first because ________.
A. her brother lived near her home
B. her brother lived far from her home
C. he thought the electricity travels faster than the sound waves
D. her brother's telephone was good
5. Whose answer was right, the first student's or Gao Hui's?
A. Gao Hui's.
B. The first student's.
C. Neither of theirs.
D. Both of theirs.
