１When drive-ins were at the height of their popularity in the late 1950's, some 4,000 existed in the United States, but today there are less than one-quarter that many.

A) there are less than one-quarter that many

B) there are fewer than one-quarter as many

C) there are fewer than one-quarter of that amount

D) the number is less than one-quarter the amount

E) it is less than one-quarter of that amount

这道题实在是搞不定了，答案是A。不知道省略了多少，哪位大N可以解释一下吗？

２The electronics company has unveiled what is claims to be the world's smallest network digital camcorder, the length of which is that of a hadheld  computer, and it weights less that 11 ounces.

A) to be the world's smallest network digital camcorder, the length of which is that of a hadheld  computer, and it weights

B) to be the smallest network digital camcorder in the world, which is as long as a handheld computer, weighting

C) is the smallest network digital camcorder in the world, which is as long as a handheld computer, and it weights

D)is the world's smallest network digital camcorder, which is as long as handheld computer and weighs

E) is the world's smallest network digital camcorder, the length of which is that of a handheld computer, weithing

这道题答案是Ｂ．关于doing位于句末的两种用法，这里显然不符合doing的主语是主句的主语，再者，从句意上理解，weight应该和length平行吧，所以也不是表结果．请教各位ＮＮ给个解释．