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举一反三
【单选题】There are approximately three quarters of a ton of termites (白蚁) for every person on Earth. It now turns out that these critters may be helping to alter the climate and affect man’s life. For years sc...
A.
It is the production by termites that is now of greater concern.
B.
What scientists worry more about is the output from burning fuels.
C.
The output from burning fuels is now rising steadily.
D.
The burning of fuels generates much less carbon dioxide than termites do.
【单选题】关于地球的环境人口容量的说法正确的是（ ）
A.
现今世界上人口太多，已大大超过了地球的环境人口容量
B.
未来世界的人口，不会达到地球环境人口容量的极限值
C.
将全球人口稳定在110亿或略多一些，可使地球上的人维持合理健康的生活
D.
目前的科技水平不能解决人口过多带来的问题，人口的进一步增长，后果不堪设想
【单选题】There are approximately three quarters of a ton of termites (白蚁) for every person on Earth. It now turns out that these critters may be helping to alter the climate and affect man's life. For years sc...
A.
low temperatures are created by using a house
B.
the house is made green in order to keep heat
C.
heat is prevented from escaping outside
D.
everything is kept green in a house