题目

17．在人工饲养条件下，如果淡水鱼不排卵，可将同种性成熟鱼的垂体提取液注射到雌鱼体内，促进其排卵。这一方法主要是利用了垂体细胞合成的（     ） A.甲状腺素       B.雌激素          C.促甲状腺素      D.促性腺激素 答案：D 完形填空。      Once, when I was a teenager, my father and I were standing in line to buy tickets for the circus.   1  , there was only one family between us and the ticket counter.      This family made a big impression on me. There were eight children, all probably under the age of 12. Their clothes were not   2   , but they were clean. The children were    3  , all of them standing in line, two-by-two behind their parents,  4   hands. They were excitedly jabbering (喋喋不休地说) about the clowns, elephants, and other acts they would see that night.      One could   5   they had never been to the circus before. It   6   to be a highlight of their young lives.      The ticket lady asked the father how many tickets he wanted. He   7   responded,"Please let me buy  8  children's tickets and two adult tickets so I can take my family to the circus." The ticket lady 9   the price. The mother's head   10  , and her lip began to quiver. The father leaned a little  11  and asked,"How much did you say?"      The ticket lady again quoted the price. The man didn't have enough money.      Seeing what   12   , my dad put his hand in his pocket,  13   a $20 bill and dropped it on the ground. (We were not wealthy in any sense of the word!) Then reached down,  14   the bill, tapped the man on the shoulder and said,"Excuse me, sir, this fell   15  your pocket."      The man knew what was going on. He wasn't begging for a handout   16   certainly appreciated the help in a desperate, heartbreaking, embarrassing  17   He looked straight   18   my dad's eyes, took my dad's hand in both of his, squeezed tightly onto the $20 bill, and with a tear running down his   19  , he replied, "Thank you, sir. This really means a lot to me and my family."      My father and I went back to our car and  20   home. We didn't go to the circus that night, but we didn't go without. (     )1. A. Immediately  (     )2. A. expensive    (     )3. A. badly-behaved(     )4. A. holding      (     )5. A. know          (     )6. A. advised      (     )7. A. happily      (     )8. A. six          (     )9. A. answered      (     )10. A. dropped    (     )11. A. nearer      (     )12. A. up to      (     )13. A. turned out  (     )14. A. picked up  (     )15. A. off        (     )16. A. and        (     )17. A. situation  (     )18. A. into        (     )19. A. head        (     )20. A. went        B. Finally    B. cheap      B. polite    B. shaking    B. understand B. recommendedB. honestly  B. eight      B. quoted    B. bent      B. harder    B. going on  B. handed out B. took up    B. from      B. but        B. condition  B. onto      B. mouth      B. got        C. Hopefully      C. plain            C. well-behaved  C. putting         C. judge          C. promised          C. bravely      C. ten              C. spoke          C. shook          C. tighter        C. happened       C. pulled out    C. sent up          C. down          C. or              C. surrounding      C. at            C. cheek          C. drove         D. Suddenly     D. bad          D. lovely       D. waving       D. sense        D. allowed      D. proudly      D. two          D. said         D. nodded       D. closer       D. the matter   D. put out      D. made up      D. out of       D. so           D. position     D. in           D. nose         D. walked