单项选择题

A．Getting help from others.
B．Always trying new methods.
C．Depending on modern machines.
D．Trusting their own ideas.
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单项选择题
The author considers it impossible to obtain no-risk food because________.
A．no food is free from pollution in the environment.
B．pesticides are widely used in agriculture.
C．many vegetables contain dangerous natural chemicals.
D．almost all foods have additives.
单项选择题
A．How winds affect temperature.B．Reasons for sudden increases in wind.C．The origin of storm systems.D．How vertical air movement influences weather.
A．How winds affect temperature.
B．Reasons for sudden increases in wind.
C．The origin of storm systems.
D．How vertical air movement influences weather.
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