Air pollution results in stronger greenhouse effect, which __________ leads to global warming. We must take measures to prevent pollution before it is too late.
A.generally | B.gradually | C.gently | D.usually |
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Air pollution results in stronger greenhouse effect, which __________ leads to global warming. We must take measures to prevent pollution before it is too late.
A.generally | B.gradually | C.gently | D.usually |
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