28. For my roommate and I(A) to reduce(B) the amount of trash we threw out each week，we had to resolve to stoping making(C) so many unnecessary purchases(D) in the first place. No error(E)

　　答案：A

　　类型：代词

　　解析：for是介词，介词后面的代词只能用宾格形式。

　　修改建议：把I改为me。

　　29. That(A) the director won an Academy Award for his most recent(B) movie surprised those of us who felt that the film was far inferior(C) to those made by several of his competitors for(D) the coveted prize. No error(E)

　　答案：E

　　no error

　　Questions 30-35 refer to the following passage.

　　(1)When Pluto was first detected in 1930，it was welcomed as a newly discovered planet. (2)Their reaction was understandable. (3)Pluto was initially thought to be about the size of Earth and therefore of proper planetary dimensions. (4)But by the late 1970s，closer observation had established that Pluto was in fact less than half the size of Mercury. (5)Dismayed，some astronomers now began to question whether so small an object deserved to be ranked among the planets.

　　(6)Pluto differs from the other planets also in that it is composed largely of ice-more like a comet than a typical planet. (7)In the 1990s it was discovered that Pluto was just the largest of hundreds of comet-like bodies occupying a region known as the Kuiper Belt. (8)Pluto，the doubters argues，should therefore be classed with these icy objects rather than with the planets.

　　(9)Rushing to Pluto’s defense，many astronomers rejected these arguments，pointing out that the established planets differ among themselves in both composition and size. (10)Mars，for instance，is composed of metal and rock，while Neptune is mostly gas. (11)Why，then，could a planet not just as well be composed of ice? (12)And as for size difference，Jupiter is 1300 times larger than Earth，but no one would suggest that the two bodies therefore cannot both be planets.

　　(13)Clearly they need to resolve the issue of Pluto’s classification. (14)In 2006 the International Astronomical Union defined a planet as a body that directly orbits the Sun，is large enough to be rounded by its own gravity，and has cleared its neighboring region of other orbiting bodies. (15)Pluto was judged to satisfy the first two criteria but not the third，because of all the Kuiper Belt objects populating its neighborhood.

　　30. In context，which of the following is the best version of the underlined portion of sentence 1(reproduced below)?

　　When Pluto was first detected in 1930，it was welcomed as a newly discovered planet.

　　(A) (as it is now)

　　(B) it was a newly discovered planet and welcomed as such

　　(C) being a newly discovered planet，it was welcomed

　　(D) the newly discovered planet was also welcomed by astronomers

　　(E) astronomers welcomed it as a newly discovered planet

　　答案：E

　　解析：Sentence 2的their指“一群人”，故Sentence 1要出现“一群人”，只有E选项是astronomers正确。ABC直接排除; D被动句，不简洁，且意思有所改变。