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 但不懂為什麼要加"an"在這裡 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 但感覺(C)也行~ 最後再詢問大家一句文法問題(所以其實有4題文法題啦嘿嘿): Harry是我們學校樂團的主唱 他會唱許多英文歌曲 這題主要是考非限定 請問以下兩句哪句會比較好 有什麼文法規定嗎? 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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