单项选择题

Many species of animal have now __________ from the face of the earth.

A．dissolved
B．vanished
C．faded
D．escaped

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单项选择题

So conservationists hope they can __________ the area's outstanding natural beauty and satisfy the tourists, too.

A．reserve
B．retain
C．preserve
D．sustain

单项选择题

I felt very __________ among all those scholars as each of them has made substantial contributions to global environment reservation study.

A．influential
B．inferior
C．superior
D．subordinate

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