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8.盛夏季节,在炎炎烈日下,人们闷热难耐,此时若来到浓荫避日的树林下会顿觉凉爽。下列事实中,可以用来解释其原因的是

   ①植物能进行蒸腾作用   ②植物能进行呼吸作用

   ③人靠出汗来调节体温   ④物体在光直射时,吸收的热量多

   (A)①②   (B)①⑧   (C)①④   (D)②③

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7.一棵重0.2kg的柳树栽培于土壤中,三年后连根挖出,称其干重达llkg,这些增加的物质主要来源是

   (A)大气中的C02   (B)土壤中的水分   (C)大气中的02   (D)土壤中的矿质元素

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6.若用质量浓度为0.3g/mI。的蔗糖溶液处理生物细胞,细胞出现质壁分离现象,对此合理的解释可能是

   (A)实验材料是根尖分生区细胞   (B)实验材料是死细胞

   (C)实验材料是蚕豆叶表皮细胞   (D)实验材料是动物细胞

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5.正在结番茄的植株,其吸收水分主要用于

   (A)光合作用   (B)茎叶生长   (C)果实膨大   (D)蒸腾作用

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4.下列前项是被鉴定的有机物、中项是使用的试剂、后项是反应所产生的颜色。三项均正确的是

   (A)DNA、双缩脲、蓝色      (B)脂肪、苏丹Ⅲ、橘黄色

   (C)蛋白质、斐林试剂、紫色   (D)可溶性还原糖、二苯胺、砖红色

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3.用胰液、肠液处理果蝇唾液腺巨大染色体,得到一连续的细长纤丝,此细丝可能是

   (A)多肽链   (B)染色质丝   (C)DNA分子   (D)染色单体

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2.纤维素是一种多糖,在下列生物中容易找到的是

   (A)水螅   (B)草履虫   .   (C)芹菜   (D)竹节虫

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1.有一类生物,从生物体的微观结构看,它没有核膜和多种细胞器,从生态系统的宏观结构看,属于生产者。这类生物是

   (A)细菌   (B)绿藻   (C)真菌   (D)蓝藻

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8. 你有必要跟老师面对面谈一下你的问题。(face to face)

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 ◆II.根据短文意思,从下表所给的词汇中选出合适的单词或短语,并用其正确形式填空。

   calm,  fell in love,  recover,  dislike,  upset,

be concerned about,  outdoors,  ignore,  grateful,  suffer from

   Last weekend, I was very 1 because I 2 my dog who 3 a strange illness. At the same time, I felt hateful toward people around me. My mother suggested me going 4 for a walk. So I did. It was the first time that I had 5 with nature, while at the same time I was forced to be alone and face all the things that I had 6 before. After the walk, I was 7 and realized that the people and things around me were very important to me. I should be 8 to all of them. I should love all of them, including the ones that I 9 . Anyway, the doctor said my dog would 10 soon.

◆   III.情景对话。

A: Hello! Tom. What’s the matter?

B: I can’t move my bike any longer.

A: Is it broken again?

B: 1

A: Leave it here and I can take you home.

B: 2 I need it to go to school tomorrow morning.

A: All right, but ... why not get it repaired? There is a man repairing bikes ahead.

B: 3 Can you help me move the bike there?

A: 4 Let’s hurry, or he will have left before we get there.

B: 5 Thank you very much!

A: You’re welcome.

A. No problem.

B. Yes, I’m afraid so.

C. No way.

D. I think that’s a good idea.

E. Certainly not.

F. You’re right.

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7. 他把所有的业余时间都用来学习,从来不参加任何体育活动。(join in)

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