题目内容
（请给出正确答案）
[主观题]
______ has been done to prevent the water in the lake from being polluted.A．LittleB．FewC．O
______ has been done to prevent the water in the lake from being polluted.
A．Little
B．Few
C．Other
D．Many
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法定计量单位力的计量单位是()。
A.公斤力
B.牛顿
C.吨力
