单项选择题

A．To make full use of the metals left.
B．To protect the forest resources from being destroyed.
C．To call for stopping using plastic meal-boxes.
D．To awaken people to the environmental problems.
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单项选择题
A．They are used for rescue work.B．They are taking the place of highflying jets.C．They have been widely used for various purposes.D．They are now used exclusively for commercial projects.
A．They are used for rescue work.
B．They are taking the place of highflying jets.
C．They have been widely used for various purposes.
D．They are now used exclusively for commercial projects.
单项选择题
A．He’ll start next week.B．He wouldn’t enjoy it.C．He would like time to decide.D．He wants his adviser’s opinion.
A．He’ll start next week.
B．He wouldn’t enjoy it.
C．He would like time to decide.
D．He wants his adviser’s opinion.
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