问牛牛几题语法~~~迷茫 啊 ，偶滴GMAT

GWD3-Q19:

Possible long-term consequences of the “greenhouse effect,” the gradual warming of the Earth’s climate, may include melting the polar ice caps and a rising sea level.

A.      may include melting the polar ice caps and a rising sea level

B.      may include the melting of polar ice caps and the rising sea level

C.      may include polar ice caps that are melting and sea levels that are rising

D.      include melting the polar ice caps and sea levels that are rising

E.  include melting of the polar ice caps and a rise in sea level

May怎么可以去掉？？

Today’s technology allows manufacturers to make small cars more fuel-efficient now than at any time in their production history.

A.      small cars more fuel-efficient now than at any time in their

B.      small cars that are more fuel-efficient than they were at any time in their

C.      small cars that are more fuel-efficient than those at any other time in

D.      more fuel-efficient small cars than those at any other time in their

more fuel-efficient small cars now than at any time in

为什么不用CD的more fuel-efficient small cars，是因为表达不清吗？

GWD3-Q39:

Minivans carry as many as seven passengers and, compared with most sport utility vehicles, cost less, get better gas mileage, allow passengers to get in and out more easily, and have a smoother ride.

A.      Minivans carry as many as seven passengers and, compared with most sport utility vehicles, cost less,

B.      Minivans, which carry as many as seven passengers, compared with most sport utility vehicles, they cost less,

C.      Minivans carry as many as seven passengers, in comparison with most sport utility vehicles, and have a lower cost, they

D.      Minivans, carrying as many as seven passengers, compared with most sport utility vehicles, cost less,

E.   Minivans, which carry as many as seven passengers, compared with most sport utility vehicles the cost is lower, and they

D为什么错？

1.GWD3-Q19:

ABC直接rule out,看到句子开头的possible了么?所以may显然reluctant了,根据平行结构直接毙掉D,选E, clear?