单项选择题

A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.
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单项选择题
A．Bringing in a guest expert on the show.B．Discussing how to change the situation.C．Getting feedback from listeners who call the show.D．Discussing whether this is a trend in all developing countries.
A．Bringing in a guest expert on the show.
B．Discussing how to change the situation.
C．Getting feedback from listeners who call the show.
D．Discussing whether this is a trend in all developing countries.
单项选择题
According to the passage, the chief purpose of explorers in going to unknown places in the past was ___________.
A．to display their country’’s military might
B．to accomplish some significant science
C．to find new areas for colonization
D．to pursue commercial and state interests
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