单项选择题

In the last sentence of the first paragraph, the phrase "engaged in" could best be replaced by which of the following

A．Committed to.
B．Involved in.
C．Attentive to.
D．Engrossed in.
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单项选择题
It could logically be assumed that the author of this passage would support legislation to______.
A．ban the use of all pesticides
B．prevent the use of automobiles in the cities
C．build additional conventional power plants immediately
D．organize an agency to coordinate efforts to cope with environmental problems
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 corrective actions
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