28. _____ 2000 of them bigger than a kilometer across, of which scientists have actually observed only a few percent. (A) There are an estimated (B) They are an estimated (C) There is an estimated (D) Of an estimated 答案是(A) There are an estimated 但不懂为什麽要加"an"在这里 29. From more highly developed cells, which have a nucleus and complex internal structure, _____ and algae, and all multicellular. (A) evolved the singled-celled protozoa (B) evolving the singled-celled protozoa (C) and the singled-celled protozoa evolved (D) and evolved the singled-celled protozoa 答案是(B) evolving the singled-celled protozoa 但不知道原因@@" 30. With about six meters of snow, the mountains there are prime destinations for skiers and snowboarders. The word "prime" in the second paragraph is similar to ____. (A) basic (B) original (C) first-rate (D) captivating 答案是(B) original 但感觉(C)也行~ 最後再询问大家一句文法问题(所以其实有4题文法题啦嘿嘿): Harry是我们学校乐团的主唱 他会唱许多英文歌曲 这题主要是考非限定 请问以下两句哪句会比较好 有什麽文法规定吗? Harry, who can sing lots of English songs, is the singer in our school band. Harry, who is the singer in our school band, can sing lots of English songs. --

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