题目

“验证绿叶在光下合成淀粉”实验的正确顺序是（ ）①用不透光纸从上下两面遮盖叶片的一部分②把实验材料放在光下照射2～3小时③把盆栽的天竺葵或其他绿色植物放于暗处2～3④用清水漂洗叶片后滴加碘夜⑤把叶片放入盛有酒精的小烧杯中隔水加热⑥摘取一片部分遮光的叶片，除去不透光纸． A . ③①②⑥⑤④ B . ④③②⑤①⑥ C . ②③④⑤①⑥ D . ②④③⑤⑥①完形填空 Robeson was born in a very poor family. At seven, hehad topick coal in a deserted mine near his home, then he sold1 he had picked and earned a few coins to help his parents. He had2schooling. For being so poor, how could he 3 school fees? When he was fifteen, he worked 4 a servant in a school. Looking at other children studying in the classroom, he felt 5 for himself. How he 6 to have the same chance! He decided to study by 7 . In the daytime, after the sweeping and cleaning was over, he8stand by the window outside the classroom trying to catch what the teacher said. At night, he tried his best to remember what he had 9 during the day. He worked 10 hard at his lessons that he sometimes had just three or four hours to sleep. The more he learned, the greater 11 he showed in his lessons. A maths teacher dis?covered him and came to like this diligent boy and 12 him to sit at the back of the class. In one exam, he was the13one in the whole school who reached the highest grade. He would have been given the scholarship 14    he had been a regular student of the school.Robeson 15 through six long years with his study of maths and wrote several articles which caught the16of some university professors. They admired his talent 17 his diligence. To give him a good chance, they hired him as a librarian and18him free guidance. Robeson felt 19 for he was sure that before him there was a broad road 20 success.1.  A. whether     B.  which       C.  that              D. what2.  A. many        B.  few      C.  little               D. much3.  A. buy        B.  afford      C.  send            D. read4.  A. as          B.  like       C.  for             D. by5.  A. angry        B.  ashamed    C.  proud            D. sorry6.  A. hated        B.  decided     C.  wished          D. regretted7.  A. the teacher    B. himself     C.  his parents    D.  his schoolmates8.  A. could        B. ought to     C.  should         D. would9. A.learned         B. foun     C.  heard of          D.  written down10. A. very          B.  so         C.  too         D. quite11. A. joy           B.  interest        C.time          D. taste12. A. allowed      B.  agreed        C.   let          D. refused13.  A. worst        B. only         C. last          D. laziest14.  A. if          B.  when        C.  though        D. because15. A. learned      B.  listened      C. mastered       D. struggled16. A. notice        B.  influence    C.  impression      D. attention17.  A. except for    B. according to    C. as well       D.  in spite of18. A. taught       B. offered       C.  lent            D. sent19. A. sad         B.  angry        C.  happy      D. disappointed20. A. leading to    B.  coming from     C. made of     D.  covered with