2019年mpacc考试英语真题——连词549

{01} The process of producing electricity may also give out CO2, ______ you heat your house with electricity instead of charcoal.

A.as long as

B.as soon as

C.as if

D.even if

解析：考查短语辨析。句意为：产生电的过程也会发出二氧化碳，即使你用电而不是用木炭加热你的屋子。故答案为D。
本题选D。

{02} The first two services are free，______the third costs￡35.

A.while

B.whether

C.what

D.which

解析：：考查连词辨析。While然而；句意：前两个服务是免费的，然而第三个值35美元。故A正确。
本题选A。