选词填空（课本22页）Some young men started smoking without realizing what the _______were.
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选词填空（课本22页）Tony Green has worked very hard to make his dream a(n) _______
选词填空（课本22页）Ann speaks ________Japanese, as she has lived there for three years.
选词填空（课本22页）The box was very heavy, but Tom still ________to carry it home.
欲将方波电压转换成尖顶波脉冲电压，应选用_____。
A. 反相比例运算电路
B. 同相比例运算电路
C. 积分运算电路
D. 微分运算电路
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