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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】【2010河北省卷】27. Sally is very happy. There is a big smile ________ her face.
A.
on
B.
to
C.
in
D.
at
【单选题】【2010河北省卷】31. —Do we have to finish our homework this afternoon?—Yes, you ________.
A.
must
B.
can
C.
may
D.
need
【单选题】【河北省2011】36. You ____eat the soup if you don't like it.
A.
shouldn't
B.
mustn't
C.
needn't
D.
can't
【单选题】光纤由传导光的纤芯和包层两同心圆形的双层结构组成,最外部有一层涂覆层,该涂层的作用是( )
A.
降低传输损耗
B.
增大信息容量
C.
增强抗干扰能力
D.
增加柔韧性
【单选题】【2010河北省卷】35. Mike ________ his computer and checked his e-mail.
A.
turned on
B.
turned off
C.
turned up
D.
turned down