{01}Many people believe we will suffer from more environmental disasters _____we change the way we live.
A.but
B.although
C.so
D.unless
解析：
本题选D。
{02}____ most of the earth"s surface is covered by water, fresh water is very rare and precious.
A.As
B.Once
C.If
D.Although
解析：
本题选D。
A.but
B.although
C.so
D.unless
解析：
本题选D。
{02}____ most of the earth"s surface is covered by water, fresh water is very rare and precious.
A.As
B.Once
C.If
D.Although
解析：
本题选D。
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