单项选择题

Very often bacteria or viruses inhabit the body without causing illness,a condition known as the "carrier state".

A．surround
B．repel
C．occupy
D．devitalize
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单项选择题
Why does the author say reducing the amount of meat in one’s diet is environmentally beneficial______
A．People who eat meat usually have weaker immune systems compared to those of vege- tarians.
B．A lot of food and water are consumed in order to raise livestock.
C．90% of animals are raised in confinement.
D．Raising Animals causes most of the destruction of the nature.
单项选择题
Which of the following is NOT mentioned in the passage as a factor that is making the water situation in the world more and more severe______
A．The increase of population.
B．The use of washing machines.
C．The use of flush lavatories.
D．The popularity of swimming pools.
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