在80天攻克雅思的阅读中有一道题很费解
原文:scientists have already designed special space factories.These factories will take advantage of absence of gravity(zero gavity)to produce everything from life-saving drugs to perfect ball bearings.
题目:Scientists have already designed special space factories,which___
A are built in outer space
B manufacture special products and tools for space use,such as medicine and perfect ball bearings
C creats surroundings free of gravity
D make such gravity-pro of products as life-saving drugs and perfect ball bearings
我觉得BD都对,可答案是A,哪位高人能为我指点迷津,不胜感激!