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It is hard _old people to change their ways.
A. to
B. of
C. to
D. in
Teachers devotes themselves _the cause of aducation.
A. to
B. of
C. in
D. to
The sea covers 71% of the earth.
A. 对
B. 错
The change in climate may affect your healthy.
A. 对
B. 错
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