prep 一题

28(网上讨论)

In some species of cricket, the number of chirps per minute used by the male for attracting females rise and fall in accordance with the surrounding temperature, and they can in fact serve as an approximate thermometer.

a.       for attracting females rise and fall in accordance with the surrounding temperature, and they can in fact serve

b.      for attracting females rise and fall in accordance with the surrounding temperature, which can in fact serve

c.       in attracting females rise and fall in accordance with the surrounding temperature, in fact possibly serving

d.      to attract females rises and falls in accordance with the surrounding temperature, and it can in fact serve

e.       to attract females rises and falls in accordance with the surrounding temperature, in fact possibly serving

answer (d) 为何and之前有逗号？

32.？网上讨论

1998 saw several new ventures promoting online distance learning both at the college and graduate level, but also faculty members in large numbers began questioning whether the computer screen was an adequate replacement for the classroom.

1. 1998 saw several new ventures promoting online distance learning both at the college and graduate level, but also faculty members in large numbers began
2. in 1998 several new ventures were promoting online distance learning for both college-and for graduate-level courses, but it was also a year for a large number of faculty members who began
3. With several new ventures promoting online distance learning both for college and graduate courses in 1998, it was also a year when a large number of faculty members had began
4. Although 1998 saw several new ventures promoting online distance learning for both college- and graduate-level courses, it was also a year when a large number of faculty members began
5. Several new ventures were promoting online distance learning in 1998, at about the college level as well as the graduate, but is was also a year for faculty members to begin in large numbers

Answer (d),  1998 can be a subject?