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90. (29271-!-item-!-188;#058&004232) Diesel engines burn as much as 30 percent less fuel than gasoline engines of comparable size, as well as emitting far less carbon dioxide gas and far fewer of the other gases that have been implicated in global warming. A
Diesel engines burn as much as 30 percent less fuel than gasoline engines of comparable size, as well as emitting far less carbon dioxide gas and far fewer of the other gases that have been implicated in global warming. A
(A) of comparable size, as well as emitting far less carbon dioxide gas and far fewer of the other gases that have (B) of comparable size, as well as emit far less carbon dioxide gas and far fewer of the other gases having (C) of comparable size, and also they emit far fewer carbon dioxide and other gases that have (D) that have a comparable size, and also they emit far less carbon dioxide gas and other gases that have (E) that have a comparable size, as well as emitting far fewer carbon dioxide and other gases having
主要是A和B的选择上，答案是A 可是A的 as well as emitting前面没有平行的对象啊 而B里面的as well as emit有平行对象burn，却用了having been done的结构
我的理解有什么问题吗？
83. (28949-!-item-!-188;#058&004110)
The number of plant and animal species that humans are known to have forced to extinction in the last half millennium is over 800.
(A) humans are known to have forced to extinction
(B) humans are known as having forced to become extinct (C) humans are known for forcing to become extinct (D) are known that humans forced to become extinct (E) are known as having been forced to extinction by humans 选A逻辑说不通啊 请问怎么翻译？看上去像是humans be extinction 请高人指点
81. (28809-!-item-!-188;#058&004029)
Both the caribou and the reindeer belong to the species Rangifer tarandus, but after 7,000 years of domestication in Eurasia, reindeer have developed a tendency to circle in tight groups, while caribou tend to spread far and wide.A
(A) belong to the species Rangifer tarandus, but after 7,000 years of domestication in Eurasia, reindeer have developed a tendency to circle in tight groups, while caribou tend
(A) belong to the species Rangifer tarandus, but after 7,000 years of domestication in Eurasia, reindeer have developed a tendency to circle in tight groups, while caribou tend (B) belong to the same species, Rangifer tarandus, but about 7,000 years of domestication in Eurasia have developed reindeer's tendency to circle in tight groups, which is different from caribou that tend (C) belong to the species Rangifer tarandus, but being domesticated in Eurasia for about 7,000 years has developed reindeer's tendency to circle in tight groups, and that is different from caribou tending (D) are the same species, Rangifer tarandus, but about 7,000 years of domestication in Eurasia have developed reindeer's tendency to circle in tight groups, while the tendency is for caribou (E) are the same species, Rangifer tarandus, but being domesticated in Eurasia for about 7,000 years has developed the reindeer's tendency to circle in tight groups, which differs from caribou tending
reindeer have ,reindeer不是单数吗？
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