27.He glanced over at her, ____that though she was tiny, she seemed very well put together.
A.noting B.noted C.to note D.having noted
26.As an athlete, nothing comes _____Jim and his morning exercise.
A.out B.between C.with D.among
25.As soon as he comes back, I’ll tell him when ________and see him.
A.you will come B.will you come
C.you come D.do you come
24.-----My brother failed in business.
-----_____.
A.I am certain he’ll make it. B.That’s really tough.
C.Everything is going well with me. D.Actually, there is no choice anyway.
23.The flight attendant welcomed us ___ the plane.
A.abroad B..aboard C.board D.broad
22.______, a man who expresses himself effectively is sure to succeed more rapidly than a man whose command of English is poor.
A.Other things being equal B.Other things be equal
C.To be equal to other things D.Other things to be equal
第一节:单项填空(共15小题;每小题1分,满分15分)从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
21.-----Shall we go to the art exhibition right away?
-----_____.
A.It’s your opinion. B.I don’t mind.
C.It’s all up to you. D.That’s your decision.
53.实验是生物学学习的一项重要内容,结合所学实验分析回答下列问题。
(1)在“DNA与RNA在细胞中的分布”实验中,所有的染色剂是 ,选用8%盐
酸的作用是 。
(2)分离获取细胞质中各种细胞器的方法是 ;制备细胞膜时,所采用的方法
叫做 。
(3)Grimton曾观察到:饥饿的原生动物的粗面内质网减少,或几乎完全消失,高尔基
体的形成停止,由于这些细胞于实验期间还继续形成分泌小泡,所以每一个高尔基
体的囊的数目减少了,但当给动物重新喂食后,形成了新的粗面内质网,同时产生
新的高尔基体,囊的能力也恢复了。高尔基体的构建和数目变化为什么与内质网一
致呢?
①你的假说: 。
②实验设计与实施: 略。
(4)在欧美,洋葱被誉为“蔬菜皇后”。其肥大的鳞茎中含糖类、维生素及各种矿质元素
等,是不可多得的保健食品。那么洋葱肥大的鳞茎中所含的糖是淀粉还是还原糖?
某生物学兴趣小组的同学以此作为研究课题。请你完成下面的实验研究报告。
①实验目的:探究洋葱肥大的鳞茎中所含的糖是淀粉还是还原糖。
②实验原理:
a.
b.
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