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【多选题】
助听器依芯片中信号处理技术的不同，分为()。A.
集体助听器
B.
耳内式助听器
C.
模拟助听器
D.
数字助听器
E.
盒式助听器
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【单选题】Collecting stamps as a hobby___________ increasingly popular during the past fifty years.A．become
A.
22．Collecting stamps as a hobby___________ increasingly popular during the past fifty years. A．becomes
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became
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has become
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had become
【单选题】Collecting stamps as a hobby______increasingly popular during the past ten years.
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【单选题】Collecting stamps as a hobby___________ increasingly popular during the past fifty years.
A.
becomes
B.
became
C.
has become
D.
had become
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A.
became
B.
becomes
C.
has become
D.
have become
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