1. Computers are becoming faster, more powerful, and more reliable, and so too are moderns, the devices that allow two or more computers to share information over regular telephone lines.
C. so too moderns, the devices allowing
答案中are的出现是为遵循尽量补出原则么？还是so too有一个固定句型？
2. Because paper of all kinds is the billets single component of municipal trash, many municipalities have tried recycling to reduce the cost of wash disposal.
这是原句，也是答案。是不是原句用现在完成时就是正确的？不然为什么不选B. Because paper of all kinds is the biggest single componet in municipal trash, many municipalities tried to recycle so that the cost of trash disposal is reduced.
3.The company is negotiating to sell its profitable credit card subsidiary and plans to use money from that sale to acquire some of the mortgage-servicing operations that are being sold by troubled savings institutions.
B. subsidiary, from which it plans to use money
B是怎么错的？答案中plans与什么并列呢？
4. In the 1980's the rate of increase of the minority population of the United States was nearly twice what it was in the 1970's.
B. twice as fast as it was in
该项为何错呢？答案中what指代什么呢，twice是adj.what不能充当其宾语啊？
5. As the etched lines on computer memory chips have become thinner and the chips' circuits more complex, the power of both the chips and the electronic devices they drive has vastly increased.
请问为何后句是chips's circuits more complex,而非完整句chips' circuits are more complex.
6.While the base salary for the top five officers of the company did not chane from 1990 to 1991, cuts were made in such nonsalary compensation as those in allowances for overseas assignments and club memberships.
those为何一定要补出？划线句后内容不是与nonsalary compensation对应么？ | 
