单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Children could learn by themselves.
B．Children liked what they learned.
C．Children liked to sit in the classroom.
D．Children sat in the classroom for hours.
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单项选择题
A．12.B．36.C．48.D．24.
A．12.
B．36.
C．48.
D．24.
单项选择题
The passage indicates that, in comparision to radio waves, gamma waves ______.
A．produce louder sound
B．are less magnetic
C．do not form in the Sun's center
D．are not long
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