单项选择题

The phrase "build on "in the last parapraph most probably means " ______ ".

A．rely on
B．give up
C．conduct an investigation into
D．pay great attention to
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单项选择题
According to this passage, one early step in any effort to improve the environment would be to ______.
A．return to the exclusive use of natural fertilizers
B．ban the use of automobiles in and around cities
C．study successful effort in other countries
D．set up a timetable for collective actions
单项选择题
In Africa, people in cities will be ______ by the end of the century.
A．almost twice as much as in 1985
B．doubled than that in 1985
C．over twice as much as in 1985
D．300 million
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