单项选择题

6，19，7，12，8，（）。

A．4
B．5
C．9
D．10

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单项选择题

The problem Howe was trying to solve was______.A．what kind of thread to useB．how to design a needle which would not breakC．where to put the needleD．how to get the thread to run smoothly around the needle

A.
A．what
B.how
C.where
D.how

单项选择题

Dreams are sometimes called 'secret messages to ourselves' because______.A．strange images are used to communicate ideasB．images which have no meaning are usedC．we can never understand the real meaningD．only specially trained people can understand them

A.
A．strange
B.images
C.we
D.only

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