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I haven ’ t received her letter though she has been there for a month. 2. — Do you know the news about Yao Ming? — No.I didn ’ t look through news recently. 3.Don ’ t worry! The train hasn ’ t the station.You can sit back on your seat. 4.Can you tell me who ( 发现 )America? 5.The six ( 宇航员 )on board will spend ten days in space. 6.I ’ ve just made a model ( 宇宙飞船 )for our school project. 7.He says he has had breakfast.He is full now. 8.We all know the ( 地球 ) goes around the sun.
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【简答题】细支气管肺泡细胞癌可起源于（ ）|类癌起源于（ ）|鳞状细胞癌起源于（ ）|腺癌起源于（ ）|小细胞癌起源于（ ）A. 主支气管黏膜上皮细胞B. 支气管腺体C. 小支气管黏膜上皮细胞D. 支气管黏膜或腺上皮内嗜银细胞E. Ⅱ型肺泡上皮细胞