单项选择题

A．By the building method through which the builders want to save energy.
B．By the limit of the flow of air between inside and outside.
C．By the building things which are made of man-made materials.
D．Not only by the limit of air -flow but also by the man-made materials.
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单项选择题
A．It can be used by farmers to protect large buildings.B．It was brought to the northern USA by Asian farmers.C．It has done more harm than good in the southern USA.D．It was introduced into the USA to kill harmful weeds.
A．It can be used by farmers to protect large buildings.
B．It was brought to the northern USA by Asian farmers.
C．It has done more harm than good in the southern USA.
D．It was introduced into the USA to kill harmful weeds.
单项选择题
A．He will return the following week.B．He will be back immediately after the holiday.C．He will come back for the holiday.D．He will begin his vacation next week.
A．He will return the following week.
B．He will be back immediately after the holiday.
C．He will come back for the holiday.
D．He will begin his vacation next week.
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