According to the passage water is important for all of the following, except______.
A. early international trade
B. the most common substance in living plant and animal tissues
C. hydroelectric power stations
D. sanitation and recreation
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According to the author, technical terms are used because ______.
A. they describe a process in details
B. they can only be understood by people of a given profession
C. they can be found in almost every dictionary
D. they can be universally understood by people of a given profession
采用双机抬吊作业时，每台起重机荷载不得超过允许荷载的( )，且应对每一吊进行试吊作业，施工中必须保持两台起重机同步作业。
A. 60%
B. 70%
C. 80%
D. 90%
It can be inferred from the passage that ______.
A. clear water on earth is unlimited.
B. fossil fuels and nuclear energy are more important than falling water from dammed-up rivers
C. part of the water used by a person or a community may eventually be used by others
D. most of the earth's hydroelectric potential has been exploited
If the author of the passage wished to study a new field, he would probably______.
A. call in a dictionary expert
B. become easily discouraged
C. look to the histories of the words in the new field
D. pay careful attention to the new field's technical vocabulary
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