单项选择题

A．No fuel.
B．Ice on the wing.
C．Engine trouble.
D．No food.
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单项选择题
A．They’’ll keep in touch during the summer vacationB．They’’ll hold a party before the summer vacationC．They’’ll do odd jobs together at the school libraryD．They’’ll get back to their school once in a while
A．They’’ll keep in touch during the summer vacation
B．They’’ll hold a party before the summer vacation
C．They’’ll do odd jobs together at the school library
D．They’’ll get back to their school once in a while
单项选择题
A．If they don’’t involve any risks.B．If they produce predictable side effects.C．When the urgent need for them arises.D．When tests show that they are relatively safe.
A．If they don’’t involve any risks.
B．If they produce predictable side effects.
C．When the urgent need for them arises.
D．When tests show that they are relatively safe.
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