问题
选择题
下列说法不正确的是[ ]
A．在探究果胶酶的用量实验中，虽然实验的变量发生了变化，但通过设置梯度来确定最适值的思想方法是不变的
B．植物、霉菌、酵母菌和细菌均能产生果胶酶
C．通过测定滤出的苹果汁的体积大小无法来判断果胶酶活性的高低
D．人们使用果胶酶、纤维素酶等来解决制作果汁面临的问题
答案
答案：C
搜题请搜索小程序“爱下问搜题”
下列说法不正确的是[ ]
A．在探究果胶酶的用量实验中，虽然实验的变量发生了变化，但通过设置梯度来确定最适值的思想方法是不变的
B．植物、霉菌、酵母菌和细菌均能产生果胶酶
C．通过测定滤出的苹果汁的体积大小无法来判断果胶酶活性的高低
D．人们使用果胶酶、纤维素酶等来解决制作果汁面临的问题
答案：C
| 完形填空。 | |||
| Farley worked for the Canadian government. One day, he was __1__ to learn more about wolves. Do wolves kill lots of caribou(北美驯鹿) Do they kill people? They gave him lots of food and clothes and guns. Then they put him on a plane and took him to __2__. The plane put him down and went away. There were no houses or people in this place. But there were lots of animals and lots of wolves. People tell terrible stories about wolves. They say wolves like to kill and eat people. Farley remembered these stories, and he was __3__. He had his gun with him __4___. Then one day, he saw a group of wolves. There was a mother wolf with four baby wolves. A father  wolf and another young wolf lived with them. Farley watched these wolves every day. The mother was a very __5__ mother. She gave milk to her babies. She gave them lessons about life. They learned how to __6__ food. The father wolf got food for the mother. The young wolf __7__ the children. They were a nice, happy family-wolf family! Farley did not need his __8__ any more. In a short time, he got on well with the family. Farley watched them for five months. He learned that many stories about the wolves were __9__. Wolves do not eat people, and they do not eat many large animals. And he also learned bad things about men. It was men who killed many caribou and wolves. Later, Farley wrote a book about wolves. He wanted people to __10__ them and not to kill them. | |||
| ( ) 1. A. seen ( ) 2. A. a small town ( ) 3. A. afraid ( ) 4. A. at times ( ) 5. A. bad ( ) 6. A. cook ( ) 7. A. shouted at ( ) 8. A. food ( ) 9. A. not good ( ) 10. A. grow | B. told B. a big city B. happy B. all the time B. good B. make B. looked into B. clothes B. not true B. have | C. heard C. a far place C. angry C. once a week C. hungry C. get C. laughed at C. gun C. not easy C. teach | D. found D. a lonely village D. tired D. every afternoon D. thirsty D. pick D. played with D. plane D. not clear D. understand |