单项选择题

The United States is concerned about ______.

A．the possibility that the nuclear material might be used to produce weapons
B．the safety of nuclear power stations
C．the pollution of the nuclear waste
D．Iran’s ability to process the nuclear waste
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单项选择题
As is suggested in the passage, the most likely result of the two alternatives in solving the fiscal problem is ______.
A．a greater concentration of middle-class residents in central cities
B．a sharp decline of the life quality in central cities
C．a boom in setting up factories and offices in central cities
D．a rapid development of public transportation
单项选择题
In the passage, cohorts (in the first line of the 4th paragraph) refer to ______.
A．the toys the miniprofessor used
B．the babies taking part in the research
C．the researchers conducting the study
D．the teachers at the day-care center
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