题目内容
（请给出正确答案）
Low levels of carbon monoxide are not poisonous for healthy individuals.
A．Y
B．N
C．NG
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更多“Low levels of carbon monoxide …”相关的问题
A．The levels of carbon monoxide rise.
B．The levels of carbon dioxide rise.
C．The focus of pollution moves to the home.
D．The world's natural resources are unequally shared.
A．mainly because the levels of carbon dioxide are rising
B．possibly because the ice caps in the poles are melting
C．exclusively due to the effect of the internal of the earth' s climate
D．partly due to variations in the output of solar energy
In terms of modulus, which order (from low to high) is correct as far as glass, carbon, and Kevlar fibers are concerned？
A．Kevlar fiber, glass fiber, graphite fiber
B．Glass fiber, Kevlar fiber, graphite fiber
C．Graphite fiber, glass fiber, Kevlar fiber
A、have both low levels of demands and responsiveness
B、have high levels of both demands and responsiveness
C、have low levels of demand but high levels of responsiveness
D、have high levels of demands but low levels of responsiveness
A.standards
B.levels
C.condition
D.quality
此题为判断题(对，错)。
What can we learn from the latest report from the climate panel？
A．If the carbon dioxide doubles, the global temperature may rise 3.5 to 8 degrees Fahrenheit.
B．Sea levels are likely to rise in this century as the result of global warming.
C．Sea water is likely to rise between 3.5 and 8 degrees in about 100 years.
D．The changes of climate will come centuries later.
ery high birth rates but poor education and very low levels of literacy.
A)unstable B )reluctant C)rational D)unsteady
To succeed, a magazine with a multimillion circulation must be aimed at______.
A．the low I.Q.
B．the high I. Q.
C．the median I.Q.
D．all I. Q. levels
The event offender, scientists conclude, is the burning of coal, oil, synthetic fuels, and natural gas. These carbon-rich fossil (从地下采掘的) energy sources release an estimated five and a half billion tons of carbon into the atmosphere each year as colorless, odorless (无味的) CO2 gas.
The increased carbon dioxide is probably not a threat to health, since normal indoor levels of the gas can run 1000 parts per million or higher without apparent harm. But it could deeply affect the way the earth is heated by the sun. The sun's energy strikes the earth principally in the form. of visible light. As the earth heats up, it radiates this energy back into space, but at the much longer wavelengths of infra- red (红外线的) light, or heat. Carbon dioxide lets the visible light pass through, but absorbs energy at infra-red wavelengths. Thus, the more carbon dioxide in the atmosphere, the more the earth's heat is blocked from escaping --just as a blanket holds in the heat of a sleeper's body.
Some scientists think the greenhouse effect already has begun: average global temperatures have risen about one degree Fahrenheit in the past 90 years. Others argue that the rise could be due to the irregular change of natural temperature.
People have different opinions about ______.
A．why the concentration of gas is rising steadily
B．to what degree the greenhouse effect can affect us
C．whether CO2 has anything to do with the greenhouse effect
D．what measures should be taken to lower the carbon dioxide levels
