单项选择题

A. The woman cannot take part in the competition.
B. The woman’s hard work won’t be in vain.
C. The woman shouldn’t waste her time.
D. The woman should prepare for it again.
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单项选择题
Land can be polluted by （） from agriculture.

A. heavy metals
B. pesticides and nitrate-poor fertilizers
C. slurry from livestock
D. rubbish
单项选择题
According to World Health Organization, how many people are killed by outdoor air pollution（）

A. 3 million.
B. 2.1 million.
C. 1.6 million.
D. 3.2 million.
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