单项选择题

A．There are too many students in the discussion.
B．Some people don’t let other people talk.
C．Questions to discuss are too easy.
D．She doesn’t have time to prepare the discussion.
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单项选择题
A．Because their environment is becoming more and more dirty.B．Because the traditional ways of treating wastes are not efficient.C．Because they are short of useful materials.D．Because they need new materials made from garbage.
A．Because their environment is becoming more and more dirty.
B．Because the traditional ways of treating wastes are not efficient.
C．Because they are short of useful materials.
D．Because they need new materials made from garbage.
单项选择题
A．In a park.B．In a museum.C．In a zoo.D．In a pet store.
A．In a park.
B．In a museum.
C．In a zoo.
D．In a pet store.
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