填空题

In some places, little is done to __________________ (把烟土尘净化，就把它排放到空中去了).

【参考答案】

make the smoke clean before it goes into the air.
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More than half of Americans now use the Internet.
单项选择题
A．She goes out for shopping.B．She is a good student.C．She always talks on the phone.D．She is good at cooking.
A．She goes out for shopping.
B．She is a good student.
C．She always talks on the phone.
D．She is good at cooking.
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