题型:完形填空 完形填空。 Shirley Yeats is certainly a very brave woman! At the age of sixty-seven, she 1 to take a trip round the coast (海岸) of Malaysia. Everything was fine 2 one day, as she was going back to her room on the 3 , she saw smoke coming out of another room. She 4 the captain from her room at once and told him about the fire. Then she went up on deck (甲板) to see 5 she could do to help. The fire spread (蔓延) very quickly and soon 6 was completely out of control. The captain decided to get all the passengers out as 7 as possible. Many of the other passengers were 8 , but Shirley remained calm (镇静的). She even helped the other passengers to 9 the lifeboats. All 1,000 passengers were in the lifeboats and not one passenger 10 in the fire. Shirley was one of the last people to leave. Later, she told reporters," I was very afraid, 11 I always knew what I had to do. I 12 all my years as a teacher helped----all that time telling people what to do!" ( )1. A. stopped ( )2. A. since ( )3. A. way ( )4. A. phoned ( )5. A. if ( )6. A. she ( )7. A. quickly ( )8. A. sleepy ( )9. A. get into ( )10. A. lost ( )11. A. and ( )12. A. need B. used B. after B. ship B. told B. how B. he B. much B. terrified B. get back toB. killed B. but B. like C. had C. until C. land C. asked C. what C. that C. well C. tired C. get off C. hurt C. so C. think D. decided D. before D. road D. ordered D. where D. it D. usually D. lazy D. get up to D. died D. or D. hate 查看答案
题型:选择题 在观察人的口腔上皮细胞的实验中,以下操作错误的是A.在载玻片中央滴加清水B.用稀碘液染色以便观察C.用细准焦螺旋将视野中模糊的物像调至清晰D.变10×和10×的镜头组合为5×和10×,可看到更多的细胞 查看答案
题型:单项选择题 DNA复制与转录过程有许多异同点中,描述错误的是()A.两过程均需聚合酶和多种蛋白因子 B.两过程均需RNA引物 C.转录是只有一条DNA链作为模板,而复制时两条DNA链均可为模板链 D.复制的产物通常大于转录产物 E.在复制和转录中合成方向都为5′→3′ 查看答案