单项选择题

A．Bacteria that we used to worry about may help to solve the environmental problems.
B．Bacteria will either destroy or build the natural world.
C．Human beings can control the nature without the help of bacteria.
D．People should be more aware of the environmental problems.
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单项选择题
A．Companies can send ads indirectly to customers over the net.B．Companies can send goods directly to department stores.C．Customers can examine and compare goods in price.D．Customers can get the goods before they pay for them.
A．Companies can send ads indirectly to customers over the net.
B．Companies can send goods directly to department stores.
C．Customers can examine and compare goods in price.
D．Customers can get the goods before they pay for them.
单项选择题
A．His father pulled him out in time.B．He stayed in an icebox.C．He left the area before the earthquake.D．Their house escaped the earthquake.
A．His father pulled him out in time.
B．He stayed in an icebox.
C．He left the area before the earthquake.
D．Their house escaped the earthquake.
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