问题 单项选择题

图中①代表新鲜菠菜叶的光合色素纸层析结果,则右图②所示结果最有可能来自于()

A.水培的洋葱叶

B.生长的柳树幼叶

C.培养的衣藻

D.秋冬的银杏落叶

答案

参考答案:D

解析:

①图中,由下而上的色素依次为叶绿素b、叶绿素a、叶黄素、胡萝卜素,②图中无叶绿素,只有叶黄素和胡萝卜素。紫色洋葱鳞片叶无上述四种色素,生长的柳树幼叶和衣藻中均有四种色素,秋天的落叶中叶黄素、胡萝卜素含量高,叶绿素已分解;故选D。

考点:叶绿体中的色素。

判断题
完形填空

第一节 完形填空 (共10小题;每小题2分,满分20分)

阅读下面短文,掌握其大意,然后从21—30各题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

The date was like any other day in his life. After school Michael walked past the   21    on the street corner. He stopped to look at the front row of shoes. And he felt   22    for himself. He really wanted to have them for his birthday.

  He   23   walked away and thought of what to tell his mother. He knew she would give  24    he liked if she could. But he also knew very well she had little money. He decided not to go home immediately, as he looked worried,his mother would   25   it. So he went to the park where he sat on the grass. Then he saw a boy in a wheelchair. He noticed that the boy   26   the wheel with his hands. Michael looked at him carefully and was   27   to see that the boy had no feet. He   28   his own feet. “It is much better to be without   29   than without feet.” He thought. There was no reason for him to feel so sorry and sad. He went away and  30  , thinking he was much luckier in life.

21. A. shop                          B. factory                            C. park                         D. house

22. A. curious                      B. sorry                        C. eager                       D. glad

23. A. sadly                         B. rapidly                            C. happily                    D. proudly

24. A. something                  B. everything                C. nothing                    D. anything

25. A. notice                        B. find                         C. feel                         D. hate

26. A. drove                        B. moved                            C. pulled                      D. carried

27. A. frightened                  B. excited                     C. surprised                  D. delighted

28. A. looked out                 B. held out                   C. put down                  D. looked down

29. A. birthday                            B. shoes                       C. money                            D. wheelchair

30. A. smiled                       B. cried                        C. regretted                  D. explained