2.细双点画线和双折线不能单线使用，只能用于中断处。
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3.粗点画线和粗虚线的应用场合完全一致。
A. 对
B. 错
4.在较小的图形上绘制细点画线有困难时，可用细实线代替。
A. 对
B. 错
In 2010 he caught a serious illness, from _effect he still suffers.
A. that
B. whose
C. which
D. what
In the dark street, there wasn't a single person_ she could turn for help.
A. that
B. who
C. from whom
D. to whom
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