单项选择题

A．Because he was never afraid of anything.
B．Because he was protected by a special medium.
C．Because he had enough experience.
D．Because it was his job.
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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.
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.
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.
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