单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．The high temperatures required for its use.
B．The lack of trained environmental engineers.
C．The opposition of automobile manufacturers.
D．The high cost of materials used in its production.
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单项选择题
A．Man will probably be able to live there in 200 years.B．Scientists are rather pessimistic about it.C．Man will probably be able to live there in 100,000 years’ time.D．Scientists are optimistic about overcoming the difficulties soon.
A．Man will probably be able to live there in 200 years.
B．Scientists are rather pessimistic about it.
C．Man will probably be able to live there in 100,000 years’ time.
D．Scientists are optimistic about overcoming the difficulties soon.
单项选择题
A．To show how politics have changed over the years.B．To point out that T-shirts often provide personal information.C．To illustrate how the printing on clothing has improved.D．To support that T-shirts are a form of art.
A．To show how politics have changed over the years.
B．To point out that T-shirts often provide personal information.
C．To illustrate how the printing on clothing has improved.
D．To support that T-shirts are a form of art.
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