21.____ most of the earth’s surface is covered by water,fresh water is very rare and precious.A.As B.Once C.If D.Although22.____ some people try to protect examination in the name of equality,others,still in the name of equality,want only to destro

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21.____ most of the earth’s surface is covered by water,fresh water is very rare and precious.A.As B.Once C.If D.Although22.____ some people try to protect examination in the name of equality,others,still in the name of equality,want only to destro
21.____ 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
22.____ some people try to protect examination in the name of equality,others,still in the name of equality,want only to destroy it.
A.If B.While C.Since D.Once
23.____,I could not bring him round to the realization of his abnormal behavior.
A.Try as I might B.As I might try
C.Try as might I D.Might as I try
24._____________ nobody was very enthusiastic about it,they decided to cancel the trip.
A.See that B.When C.So D.Seeing that
25.Darkness had fallen and a keen wind was blowing ____ the streets were deserted.
A.when B.while C.so that D.until

21.____ most of the earth’s surface is covered by water,fresh water is very rare and precious.A.As B.Once C.If D.Although22.____ some people try to protect examination in the name of equality,others,still in the name of equality,want only to destro
21.D.although表示让步关系.
22.B.while表示让步关系,“尽管”.
23.C.as引导让步状语从句时,要将表语,状语或部分谓语动词提到as的前面.
24.D.seeing that的意思是“由于,因为,鉴于”.
25.C.so that引导结果状语从句.