According to analysts, an alliance between three major personal computer companies and most of the nation’s largest local telephone companies would enable customers to receive internet data over regular telephone lines with speeds much higher than is currently possible.
A. with speeds much higher than is
B. with speeds that are much higher than are
C. at much higher speeds as are
D. at much higher speeds than that
E. at speeds much higher than are
答案为E
疑惑：此题是明显的比较的平行结构，所以比较双方的谓语动词应该是统一的，而companies enable sth to do..thancurrently possible. 所以一这个currently possible 前面不应该是be动词吧？
Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture to 1950.
A. Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture
B. Between 1990 and 2000 the growth of the global economy was more than that during 10,000 years, from when agriculture began
C. The growth of the global economy between 1990 and 2000 exceeds that which had been for 10,000 years from the beginning of agriculture
D. The growth of the global economy between 1990 and 2000 exceeds what it has been for 10,000 years, from when agriculture began
E. The growth of the global economy between 1990 and 2000 exceeded what it did for the 10,000 years from the beginning of agriculture
答案为A
两个疑问：
1.是介词+when 是正确吗？
2.仍然是平行结构：但是during the 10000不是应该用完成时态吗？
A survey of entrepreneurs who started companies last year shows that while virtually all did substantial preparatory research and planning, only half used that work to produce a formal business plan. Since, on average, the entrepreneurs without formal plans secured the capital they needed in half the time of those with plans, these survey results indicate that, in general, formal plans did not help the entrepreneurs who produced them to secure the capital they needed.
Which of the following, if true, most seriously weakens the argument?
A. Companies started by entrepreneurs who had used formal business plans to attract investment were on the whole as profitable in their first year as were companies started by entrepreneurs who had not produced such plans.
B. In surveys of entrepreneurs who have attempted without success to raise sufficient capital, more than half of the respondents indicate that they have produced a formal business plan.
C. Among the entrepreneurs surveyed, those who did not produce formal business plans sought and received a much larger proportion of their capital from investors with whom they had a long-standing business relationship.
D. The entrepreneurs surveyed who did not produce a formal business plan spent nearly as much time doing preparatory research and planning as the entrepreneurs who produced plans.
E. The entrepreneurs who produced business plans generally reported later that the process of writing the plan had increased their confidence that their company would succeed.
我想问的是数学