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．The local Africans are very peace-loving people.B．Soda bottles are very precious in some remote areas.C．A trivial thing may sometimes bring about undesirable consequences.D．Caution must be taken in introducing new technology.
A．The local Africans are very peace-loving people.
B．Soda bottles are very precious in some remote areas.
C．A trivial thing may sometimes bring about undesirable consequences.
D．Caution must be taken in introducing new technology.
单项选择题
A．The development of computer.B．How the computer affect different areas especially the business field.C．People are keen on the information superhighways and the Internet.D．The difference between portable computer and personal computer.
A．The development of computer.
B．How the computer affect different areas especially the business field.
C．People are keen on the information superhighways and the Internet.
D．The difference between portable computer and personal computer.
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