9. As long as you keep on working hard like this, you’ll be _______ into a university you’d like sooner or later.
A. given B. permitted C. admitted D. taken
8. You ________ step into the same river twice. Everything is changing.
A. can’t B. shouldn’t C. mustn’t D. daren’t
7. If the weather had been better yesterday, we could have had a picnic. But it ______ all day.
A. has rained B. rains C. rained D. had rained
6. Jack and Peter would like to go to the concert, but _______ has got a ticket.
A. both of whom B. both of them C. neither of them D. neither of whom
5. She remained _______ there for a good hour, which surprised all the other students.
A. to stand B. stand C. stood D. standing
4. One thousand dollars a month is not a fortune but would help cover my living _______.
A. bills B. expenses C. prices D. charges
3. We all know it will be next June _______we can really have a rest.
A. when B. before C. since D. until
2. --How about _________ evening party this weekend?
--That’s great. I’m sure it will be ________ success.
A. an; a B. the; a C. an; 不填 D. the; 不填
第一节:语法和词汇知识(共15小题;每小题1分,满分15分)
1. --My mum is ill in hospital. I’m so worried.
--____________. I think she will be better soon.
A. Take your time B. Take it easy
C. Don’t mention it D. You must be joking
34.(8分) 植物叶绿素的合成需多种条件,如光照、适宜的温度和必要的矿质元素等。为验证叶绿素合成需要的条件,有人设计了如下实验:
实验步骤:
① 配制含有蔗糖、水、琼脂及植物必需的所有矿质元素的1号培养基和不含Mg2+(其它成分与1号相同)的2号培养基,调至适宜pH备用。
② 取250mL锥形瓶四个,标号甲、乙、丙、丁,并分别装入等量的培养基。甲、丙、丁装入1号培养基, 乙装入2号培养基,并进行灭菌处理,然后冷却。
③ 选取40粒小麦种子,用清水浸泡后,消毒,将种子的胚剥落下来,去掉胚乳,在无菌条件下,将胚等量接种在四个锥形瓶的培养基上。
④ 将四个锥形瓶置于以下条件下培养:
甲和乙:充足光照,适宜温度30℃;丙: ;丁:充足光照,温度10℃。
实验结果:
组别 |
甲 |
乙 |
丙 |
丁 |
幼苗颜色 |
绿色 |
黄色 |
黄色 |
黄绿色 |
请分析回答下列问题:
(1)请在上述实验步骤中补充丙组的实验条件。
(2)为什么每个锥形瓶中均接种10粒种子的胚,而不是只接种1粒种子的胚?
(3)实验中为何不采用完整的种子,而是去掉胚乳,将胚接种在培养基上萌发?
(4)甲组在此实验中的作用是 。
2009~2010学年度第一学期 期中试卷
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