单项选择题

Passage One
Questions 26 to 29 are based on the passage you have just heard.

A．Its chemical elements must be studied.
B．Its temperature must be lowered.
C．Big spaceships must be built.
D．Its atmosphere must be changed.
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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.
单项选择题
A．A fuel that burns cleanly.B．An oil additive that helps cool engines.C．A material from which filters are made.D．An insulating material sprayed on engine parts.
A．A fuel that burns cleanly.
B．An oil additive that helps cool engines.
C．A material from which filters are made.
D．An insulating material sprayed on engine parts.
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