1.单选题- (共3题)
①原鸡产生了可遗传的产蛋多的变异
②产蛋多的变异逐代积累而得到加强
③人们专门饲养和繁殖产蛋多的鸡
A.①②③ | B.③②① |
C.①③② | D.②③① |
A.生物进化的内因是生物能产生各种变异 |
B.生物进化的外因是生物生存的各种环境条件 |
C.环境条件对生物的各种变异进行选择,使适者生存,不适者被淘汰 |
D.长期的生物进化,使生物出现了适应性和多样性 |
2.选择题- (共4题)
It was a cold snowy morning after the winter vacation. And it was my first 1 at my new school. I was walking alone slowly and 2 about lots of things. It was early and there weren't many people on the road. Suddenly a girl who was 3 a bike on ice fell down. She was trying hard to get up but fell again. 4 thinking, I went over and helped her. She said “5” with a smile and then rode away. Her words warmed me a lot.
Finally, I got to school. The teacher led me to the 6 and introduced me to the class. Then he asked me to sit down beside a girl. I felt so 7 that I didn't dare to look at her. Soon the first class, 8, started. Their textbooks were different from those in my old school. As I was wondering 9 to do, an English book appeared in front of me. “Let's share,” the girl beside me said, “Hi, I'm Carrie.” I 10. It was the girl I helped this morning. Later on, we became good friends.
From that I learned: to help others is actually to help ourselves!
— Of course not. I thought you could follow me.
In a small town, there lived a doctor. He was good and kind. He was ready to go and help people. People always went to him when they were ill.
Many years later, the doctor began to forget things. The people were afraid and little by little, they stopped going to him. The doctor saw his business (生意) wasn't as good as before. He thought, “Well, if I were the patients(people who don't feel well), I'd be afraid to go to me too. Maybe it's time for me to stop being a doctor. But if this town has no doctor, what will the people do when they become ill?”
His wife heard him talking to himself and said, “Why don't you find a young doctor to take your place? Then people will have another good doctor to take care of them and I will get my husband back.”
The doctor did as what his wife said. He found a very good young doctor to help the people. The doctor and his wife then had time to take long walks together, go dancing, go traveling and spend the rest of their days together.
In a small town, there lived a doctor. He was good and kind. He was ready to go and help people. People always went to him when they were ill.
Many years later, the doctor began to forget things. The people were afraid and little by little, they stopped going to him. The doctor saw his business (生意) wasn't as good as before. He thought, “Well, if I were the patients(people who don't feel well), I'd be afraid to go to me too. Maybe it's time for me to stop being a doctor. But if this town has no doctor, what will the people do when they become ill?”
His wife heard him talking to himself and said, “Why don't you find a young doctor to take your place? Then people will have another good doctor to take care of them and I will get my husband back.”
The doctor did as what his wife said. He found a very good young doctor to help the people. The doctor and his wife then had time to take long walks together, go dancing, go traveling and spend the rest of their days together.
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【1】题量占比
单选题:(3道)
选择题:(4道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:3
7星难题:0
8星难题:0
9星难题:0