单项选择题

（）is known to all,good friends add happinesss and value to each other's life.

A.As
B.Since
C.Like
D.Though

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单项选择题
The basic causes are unknown though certain conditions that may lead to cancer have been（）.

A.conveyed
B.identified
C.notified
D.guaranteed
单项选择题
No ready technical data available,we managed to（）them.

A.go without
B.go off
C.go up
D.go down
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