Life as we know exists on the earth because the atmosphere _________.
A: contains a layer of ozone gases.
B: about 42 degrees colder than on the ground.
C: 21% oxygen by weight.
D: less than 1% of xenon by volume
E: about 75 degrees colder than in Interlaken
F: is warmed by the earth’s heat.
A: contains a layer of ozone gases.
B: about 42 degrees colder than on the ground.
C: 21% oxygen by weight.
D: less than 1% of xenon by volume
E: about 75 degrees colder than in Interlaken
F: is warmed by the earth’s heat.
举一反三
- The atmosphere consists of _________. A: contains a layer of ozone gases. B: about 42 degrees colder than on the ground. C: 21% oxygen by weight. D: less than 1% of xenon by volume E: about 75 degrees colder than in Interlaken F: is warmed by the earth’s heat.
- A variety of gases trapped in the Earth’s atmosphere can ensure life on Earth because they are ______.
- what the analogy is: which two things are being compared?The earth’s atmosphere is like a blanket of gases around the earth. It is only a thin layer but it helps to maintain the temperature of the earth, keeping us warm. It also offers a layer of protection from the intensity of the sun. A: earth’s atmosphere and a blanket B: earth’s atmosphere and gases C: earth’s atmosphere and a layer of protection D: earth’s atmosphere and a blanket of gases
- We know the atmosphere as ______. A: the total amount of oxygen over the earth B: mixture of gases surrounding the earth C: a source of storms D: the diffusion of waste gas
- The reason why colonists will probably live longer is that ________. A: their hearts will suffer less strain than on the earth B: they live in a less crowded and less polluted world C: the days and nights on Venus are much longer than on the earth D: the life on Venus will be more comfortable than on the earth