单项选择题

Not all the solar energy released by the sun reaches the earth’s surface. About 34% is scattered into space by the gases or dust in the atmosphere. Another 19% is absorbed by the different layers of the atmosphere. The remaining 47% finally reaches the ground where it is absorbed as heat.
How much of the solar energy is absorbed as heat

A. 19%
B. 34%
C. 53%
D. 47%.
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单项选择题
How does it happen that children learn their mother tongue so well When we compare them with adults learning a foreign language, we often find this interesting fact. A little child without knowledge or experience often succeeds in a complete mastery of the language. A grown-up person with fully developed mental powers, in most cases, may end up with a faulty and inexact command. What account for this difference What may happen in most eases when a grow-up tries to learn a foreign language
A. He succeeds in a complete mastery of the language.
B. He develops full knowledge of the language.
C. He develops an inexact command of the language.
D. He confuses his mother tongue with the foreign languag
单项选择题
Every year earthquakes are responsible for a large number of deaths and a vast amount of destruction in various parts of the world. Most of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or. in a line which extends from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself. An example of this is the collapse of buildings as a result of the quake itself. Other damage results from landslides or major fires which are initiated by the quake. Many damaging earthquakes occur
A. under the Pacific Ocean.
B. near Alps in Europe.
C. in a strip around the Pacific.
D. ill Burm
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