76. How much energy given off by the sun reaches the earth?
A. 100% but indirectly. B. 5%.
C. 50%. D. only a very tiny amount.
77. The reason why all the solar energy falling on the earth can’t be utilized is that ______.
only a very small part is available  the sun is too distant from the earth
it takes thousands of years for this energy to be stored up in coal and oil
our scientific knowledge is not sufficient
78. Which of the following statements is NOT true?
Even windmill’s action depends on the sun.
The sun produces enormous energy for man to make use of.
Some day man will be able to utilize 100% of the solar energy that gets to the earth.
The sun produces different heating effects in different places.
79. In order to support this argument, the writer gives the example that _______.
a machine using solar energy efficiently has already been developed
the sun is our final source of power
man uses only a tiny part of the sun’s energy
the part of the sun’s energy we use is used indirectly
80. This passage centers mainly on ________.
harnessing energy through chemistry
our last source of power
how water power is produced
the amount of solar energy that can be utilized
Ⅴ. Writing (20 points)
Directions:
For this part, you are allowed 20 minutes to write a letter of about 80 words according to the following topic.
男女应该平等吗？(Should Men and Women Be Equal?)