单项选择题

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．Happy.B．Depressed.C．Angry.D．Cheerful.
A．Happy.
B．Depressed.
C．Angry.
D．Cheerful.
单项选择题
A．Susan is a fast worker.B．Susan did Jack’’s homework.C．Susan didn’’t to the homework on her own.D．Susan has not finished her homework.
A．Susan is a fast worker.
B．Susan did Jack’’s homework.
C．Susan didn’’t to the homework on her own.
D．Susan has not finished her homework.
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