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

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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
单项选择题
（）may seem helpful behavior to you can be understood as interference by others.

A.It
B.What
C.That
D.Which
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