6，19，7，12，8，（）。

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

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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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