291.The wings of the plane are ______ of its body.

A.more than the length twice

B.twice more than the length

C.more than twice the length

D.more twice than the length

292.______ people in the world are sending information by email every day.

A.Several million

B.Many millions

C.Several millions

D.Many million

291.答案是C；

考查倍数的表达。

292.答案是A；

习惯说millions of people,而不说many million people。