问题
选择题
下列叙述不正确的是 [ ]
A．天然蛋白质水解的最终产物是多种α-氨基酸
B．所有的蛋白质遇到浓硝酸都变黄
C．人工合成的具有生命活力的蛋白质--结晶牛胰岛素是中国科学家在1965年合成的
D．可以用灼烧的方法来鉴别蛋白质
答案
答案：B
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下列叙述不正确的是 [ ]
A．天然蛋白质水解的最终产物是多种α-氨基酸
B．所有的蛋白质遇到浓硝酸都变黄
C．人工合成的具有生命活力的蛋白质--结晶牛胰岛素是中国科学家在1965年合成的
D．可以用灼烧的方法来鉴别蛋白质
答案：B
| 阅读理解。 |
| One day John took two of his friends into the mountains. They put up their tents (帐篷) and then rode off to the forest to see how the trees were growing. By afternoon when they were about ten kilometers from their camp (营地), it started to snow. A moment later, more and more snow fell. Soon they could hardly see the road. John knew there were two roads. One road went to the camp, and the other went to John's house. But all was white now. Everything was the same. How could he take his friends back to the camp? John had an idea. The horses! Let the horses take them back! But what would happen if the horses took them to the wrong way? That would be a long trip in such cold weather! It was getting late. They rode on and on. At last the horses stopped. Where were they? None of them could tell. John looked around. What was that under the trees? It was one of their tents! |
| 1. John and his two friends went to the forest to . |
[ ] |
| A．put up their tents B．build their camp C．find their way back D．see the trees |
| 2. They could hardly find their way back because . |
[ ] |
| A．there was only one road to their camp B．they couldn't decide which of the two roads went to their tents C．there was not any road at all in the mountains D．everything was covered (覆盖) by snow |
| 3. Obviously (显然), they wanted the horses to take them . |
[ ] |
| A．to John' house B．to the camp C．to the forest D．to the mountains |
| 4. The horses stopped because . |
[ ] |
| A．it was getting late B．they were tired after long running C．they had got back to the camp D．they saw the trees |
| 5. When did the story happen? It happened . |
[ ] |
| A．on a cold winter day B．on a dark evening C．on a dark afternoon D．on a sunny winter day |