单项选择题

One major obstacle to economic development is population growth. The populations of most developing countries grow at a rate much faster than that of in dustrialized countries. One reason for this growth is the high crude birth-rate—the number of live births per 1,000 people.（）

A. to
B. The populations
C. that
D. live births

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单项选择题
Television is one of the means by which these feelings are created and conveyed— and perhaps never before it’s served so much to connect different peoples and nations as in the recent events in Europe.（）

A. by which
B. it’s served
C. peoples and nations
D. as
单项选择题
The English speaker has at his disposal a vocabulary and a set of grammatical rules which enable him to communicate his thoughts and feelings, in a variety of styles, to the other English speakers. His vocabulary, in particular, both that which he uses actively and that which he recognizes, increases in size as he grows old, as a result of education and experience.（）

A. at his disposal
B. enable
C. the other
D. both that which
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