单项选择题

Scientists think ______ helps some trees to conserve water in winter.

A．when losing leaves
B．leaves are lost
C．that losing leaves
D．the leaves losing
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单项选择题
In that country, guests tend to feel they are not highly ______ if the invitation to a dinner party is extended only three or four days before the party date.
A．admired
B．regarded
C．expected
D．worshipped
单项选择题
Just as the soil is part of the earth, ______ the atmosphere.
A．as it is
B．the same is
C．so is
D．and so is
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