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【单选题】
关于块的定义,以下说法( )是正确的A.
将文件中所有插入的图块都删除，图块的定义就不存在了
B.
将文件中所有插入的图块都炸开，图块的定义就不存在了
C.
如果图中存在使用某个块定义的块，则这个块不能被重定义
D.
如果图中存在使用某个块定义的块，则这个块不能被清除掉
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【单选题】Lots of rescue workers were working around the clock, _____ supplies to Yushu, Qinghai Province after the earthquake. [ ]
A.
sending
B.
to send
C.
having sent
D.
to have sent
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【单选题】Lots of rescue workers were working around the clock, _____ supplies to Yushu, Qinghai province after the earthquake. [ ]
A.
sending
B.
to send
C.
having sent
D.
to have sent
【简答题】Please list the components of a draft.
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