单项选择题

A．A new fuel for buses.
B．The causes of air pollution.
C．A way to improve fuel efficiency in buses.
D．Careers in environmental engineering.
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单项选择题
A．How she is able to look younger and more energetic than her age.B．What is the best age of one’’s life and how she feels about her age.C．How people in their 20s and 30s differ in their attitudes toward what to do with their lives.D．Why people buy expensive face creams and if they really work.
A．How she is able to look younger and more energetic than her age.
B．What is the best age of one’’s life and how she feels about her age.
C．How people in their 20s and 30s differ in their attitudes toward what to do with their lives.
D．Why people buy expensive face creams and if they really work.
单项选择题
A．He is confident.B．He is worried.C．He is bored.D．He is angry.
A．He is confident.
B．He is worried.
C．He is bored.
D．He is angry.
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