GWD语法题求教

stellapan95

1.Antarctica receives more solar radiation than does any other place on Earth,yet the temperatures are so cold and the ice cap is reflective,so that little polar ice melts during the summer; otherwise,the water levels of the oceans would rise 250 feet and engulf most of the world’s great cities.
A.is reflective,so that little polar ice melts during the summer; otherwise,
B.is so reflective that little of the polar ice melts during the summer; were it to do so,
C.so reflective that little polar ice melts during the summer,or else
D.reflective,so that little of the polar ice melts during the summer,or
E.reflects so that little of the polar ice melts during the summer; if it did

答案是B。我想请问一下A为什么不对，以及B中的were it to do so怎么理解？


2.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
答案是A。
D是哪里不对呢？