磁体上（）最强的部位叫做磁极。
A、吸引力
B、导磁力
C、导电性
D、磁性
参考答案：D
------It’s said that the famous writer will give us _________ advice on writing.
------_________ good news! I’m weak at it.
A．a; How a
B．an; What
C．some; What
D．any; How
蔬菜削皮机用于去除土豆、胡萝卜、芋头等质脆的（）蔬菜的外皮。
A.根茎类
B.瓜果类
C.果蔬类
D.干果类
