问题 阅读理解

阅读理解。

     This year, Chongqing primary schools decide to start morning classes an hour later. This will help

students feel less tired. And most primary schools will begin the first classes at about 9 o'clock in the

morning.

      The students are happy about the change.

      Liu Ming told us that his class were excited by the news on the first aay of the school. "Great!

From now on we students at Hope Primary School don't have to get up so early!" Liu said that he used

to get up at 6:40 a.m. Now he can get up at 7:50 a.m. because class doesn't start until 8:50 a.m.

     Wu Hong feels the same. She said the new timetable (时间表) was good for her health. "I used to

get up at 6:30 a.m. I had to drink coffee every night, or I would feel too sleepy to finish my homework,"

said Wu. "Now I can fin- ish it without coffee. Because I can sleep a little longer. "

      Many teachers say the change will help students learn better. "Students used to doze (瞌睡) for the

first two classes in the morning," said Huang Shan, an English teacher at No. 1 Primary School. "But

now they are active and learn much better than before. "

      But some parents are worried that more sleep will mean less learning. There used to be five classes

in the morning. Now there are only four. In fact, every coin has two sides. So does the change in the

school timetable.

1. This year, most Chongqing primary schools started the first class at about _____. [ ]

A. 8:30 a.m.

B. 6:40 a.m.

C. 7:50 a.m.

D. 9:00 a.m.

2. Hearing the news, the students at Hope Primary School felt _____.[ ]

A. worried

B. sad

C. excited

D. angry

3. How many classes are there in the morning in Chongqing primary schools now? [ ]

A. Five.

B. Four.

C. Three.

D. Two.

4. _____ used to drink coffee at night in order to finish homework. [ ]

A. Some parents

B. Liu Ming

C. Wu Hong

D. Huang Shan

5. Which is RIGHT according to the text (按照短文意思)? [ ]

A. The students in No.1 Primary School used to doze for the first two classes in the morning.

B. All the parents say the change will help students learn better.

C The students will have to get up one hour earlier than before.

D. Many teachers are worried that more sleep will mean less learning.

答案

1-5  DCBCA

读图填空题

下 * * 幅图中:图中甲表示动物干细胞进行的一系列生理过程,乙表示哺乳动物乳腺细胞合成并分泌乳腺蛋白过程中生物膜面积变化,丙为流感病毒,请据图回答问题:

(1)甲图中A细胞经过①②过程形成细胞C,C经过③形成细胞D,则③过程表示________,它发生在生物体的整个生命进程中。

(2)科学家提供35S标记的氨基酸培养哺乳动物乳腺细胞,测量细胞合成并分泌乳腺蛋白过程中各种膜结构的面积变化,结果如乙图,其中a、b、c代表膜结构名称。那么,放射性标记在a、b、c中出现的先后顺序为__________。(用字母a、b、c及箭头表示)

(3)若甲图中D细胞分泌的X物质为蛋白质类物质,蛋白质类分泌物除可能是酶外,还可能是_______、__________(至少写出两类可能的分泌物名称)。从物质X排出细胞过程中细胞内各部分生物膜结构和功能的关系分析,可以说明____________。

(4)将该动物干细胞进行动物细胞培养,在培养过程中,利用3H标记的胸腺嘧啶脱氧核苷酸标记某一细胞,在不同间隔时间下进行放射显影,得到下图所示结果。

实验结果注明:

Ⅰ.开始观察,细胞已被标记 Ⅱ.标记细胞开始进入分裂期 Ⅲ.观察到细胞分裂期中期的细胞

Ⅳ.开始观察到两个细胞被标记 Ⅴ.标记细胞进入分裂期 Ⅵ.开始观察到四个细胞被标记

从实验结果分析可知该动物干细胞的细胞周期为____________h。

(5)图丙所示生物常使人及其他生物产生疾病,该类生物与人体细胞在结构上的主要区别是__________。

问答题