OG 16-34题
Although schistosomiasis is not often fatal, it is so debilitating that it has become an economic drain on many developing countries.
(A) it is so debilitating that it has become an economic
(B) it is of such debilitation, it has become an economical
(C) so debilitating is it as to become an economic
(D) such is its debilitation, it becomes an economical
(E) there is so much debilitation that it has become an economical
选A，og对C的解释是：
C The construction so x as to y is not a correct idiom.
还有一道题：
In the 1980's the rate of increase of the minority population of the United States was nearly twice as fast as the 1970's.
划线部分：twice as fast as
A.不变
B.twice as fast as it was in
C.twice what it was in
D.two times faster than that of
E.two times greater than
