I could hardly tell the twins apart beca

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问题选择题

I could hardly tell the twins apart because their appearances are only _____ different. [ ]

A. slightly

B. gradually

C. personally

D. extremely

答案

答案：A

选择题

Though great efforts have been on their study, Annie still can't make any improvements, which makes

her parents greatly ______ .[ ]

A. made; disappointed

B. done; disappointing

C. taken; disappointed

D. given; disappointing

单项选择题

色度信号的频率范围是（）。

A．0～1MHz

B．0～1.3MHz

C．4.43±1.3MHz

D．0～6MHz