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【单选题】
设函数f(x)在x＝0处连续，下列命题错误的是A.
若 存在，则f(0)＝0．
B.
若 存在，则f(0)0．
C.
若 存在，则f(0)存在．
D.
若 存在，则f'(0)存在．
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反馈参考答案：
举一反三
【简答题】景物制作通常需要四类材料:结构材料、连接材料、塑形材料、( )。
【单选题】The question of ______ the traffic accident happened hasn't been answered yet, though the police have made on-the-spot investigation.
A.
that
B.
whether
C.
how
D.
whenever
【单选题】The mother who lost her son insisted that the careless driver for the traffic accident ___ yesterday .
A.
was to blame ; happening
B.
be to blame ; happened
C.
be blamed ; was happened
D.
was to blame; had happened
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