检波器失真度也叫谐波失真，常规勘探一般为（）。
A.0.1%
B.0.2%
C.0.3%
D.0.4%
参考答案：B
It's difficult to live in a foreign country,________ if you can't speak foreign languages．[ ]
A．mainly
B．really
C．luckily
D．especially
李明看一本故事书，5天看了115页．照这样的速度，剩下的207页，还要多少天才能看完？
