填空题

【参考答案】

for：to(改for为to).apply for意为“申请；请求”；apply to。意为“适用”，此句应为后者之意。
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单项选择题
In some cases, recycling could be hazardous to the environment if special precautions are not taken because ______.
A．industrial emissions are sometimes created in the process
B．chemical waste is sometimes produced as a result
C．a great deal of energy is expended to create new products
D．there are a lot of bacteria in waste things
填空题
is：are(改is为are)。因为主语single people指的是“单身者”，是一类人，而不是“一个人”的意思，所以谓语动词应为复数。
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