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【单选题】
听力原文：M：May I watch what you're doing? W：Sure. You dig a hole，put in the seed，cover“with dirt，and then water it. Q：What is the woman doing? (5)A.
She is looking for water.
B.
She is planting something.
C.
She is getting dirty.
D.
She is looking for something.
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举一反三
【简答题】普通调幅信号的（）与调制信号的（）
【单选题】In drawing up the plan, they went to the library to _____ many books. [ ]
A.
bring up
B.
referr to
C.
look for
D.
try on
【简答题】用低频信号去改变高频信号______的过程，称为调幅。普通调幅信号的特点是：已调信号的包络变化与______信号变化规律相同，内含______分量，______分量和______分量。
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