单项选择题

Environment makes ______ we are，If we damage the environment, we’ll endanger ourselves.

A.how
B.who
C.what
D.before
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单项选择题
When you’re reading a document, underlining may help to keep your mind ______ on the material.
A.focus
B.focused
C.to focus
D.having focused
单项选择题
The factory produced many famous cars, none of ______ shipped to foreign countries.
A.them
B.which
C.it
D.what
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