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（1）若图甲是癌细胞的细胞膜，则膜上含量较正常细胞减少的物质是[ ] 。
（2）若图甲是线粒体膜，b和c过程运输的气体分别是 。b、c运输方式符合图 所表示的物质运输曲线。
（3）若图甲表示人体红细胞膜，则表示Na＋、K＋运输的分别是图中 。Na＋、K＋的运输方式符合图 所示曲线。
（4）已知红细胞吸收葡萄糖是协助扩散，而有人认为小肠上皮细胞以主动运输的方式吸收葡萄糖，请设计实验加以确定。
①实验步骤：
第一步：取甲、乙两组生理状况相同的小肠上皮细胞，放入适宜浓度的含有葡萄糖的培养液中。
第二步：甲组细胞给予正常的呼吸条件， 。
第三步： 。
②预测实验结果并分析：
a．若甲、乙两组细胞对葡萄糖的吸收速率基本相同，则 。
b． 。 查看习题详情和答案>>
Complete the following dialogue. 选择方框内适当的句子完成下列对话, 用A, B, C, D, E或F表示.
(1) A: Flat A is cheaper than Flat B.
B: (1)
(2) A: What is the date of Women's Day?
B: (2)
(3) A: Which country has the largest population?
B: (3)
(4) A: Let's water the trees in our housing estate, shall we?
B: (4)
(5) A: I'd like to choose this TV set. (5)
B: I think it's too expensive.
(6) A: (6)
B: No, you needn't.
(1) ________ (2) ________ (3) ________ (4) ________ (5) ________ (6) ________
查看习题详情和答案>>2. I get up ___ 6:10 in the morning.
3. I sit far ___ Li Ming. His seat is not near mine.
4. Mr. Black lives ___ my house. You can see his house from my window.
5. Do you do your homework ___ the evening?
6. Bob is talking ___ his daughter.
7. He is leaving ___ Changchun.
Once a great boxer, Tom went to an inn for dinner. He took off his coat and left it at the door, but he was afraid that someone would take it away. So he took a piece of paper and wrote on it, "The great boxer, Tom, leaves his coat here; he will be back in a few minutes." Then he put the paper on his coat and went to have his dinner. When he came back after dinner, he found that his coat was not there. But another note was left there. It said, " A great runner takes away your coat, and he will never come back."
判断下列句子是否符合短文内容。符合的用“T”表示，不符合的用“F”表示。
1. A great runner, Tom, went to an inn for dinner.
[ ]
2. Tom left his coat at the door of the inn, but no one dared（敢）to take it because he was a great boxer.
[ ]
3. When he came back, he found the piece of paper was still there, but his coat was not.
[ ]
4. The thief was not really a great runner.
[ ]
5. Tom caught the thief at last.
[ ]
查看习题详情和答案>>One day a man went to the house of a friend. He took some bread for his lunch because his friend lived far away. As he went along,he thought to himself that his friend would give him something nice to eat. So he threw（扔）the bread away. He went on and at last he came to a river. It was very wide, and there was no boat. The man couldn't get across（渡过）the river. He waited and waited but no one came. The sun began to set. The man had to come back home. On his way home he felt hungry and wanted very much to have something to eat. But he didn't have anything. Suddenly he saw some dry dusty（满是灰尘的）bread on the side of the road. He was very happy. He picked the bread up and ate it.
1. A man went to visit a friend one day.
（ ）
2. He threw away the bread because it was not nice.
（ ）
3. He didn't eat anything for his lunch.
（ ）
4. His friend lived on the other side of the river.
（ ）
5. He didn't meet his friend because his friend wasn't at home.
（ ）
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