单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

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.
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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.
单项选择题
A．They can tell people apart by how they behave.B．They can type each other.C．They can tell good people from bad ones.D．They can recognize human faces.
A．They can tell people apart by how they behave.
B．They can type each other.
C．They can tell good people from bad ones.
D．They can recognize human faces.
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