问题
问答题 简答题
乙炔与氯化氢在氯化汞催化剂作用下生成氯乙烯的反应式？
答案
参考答案：
C2H2+HCl→C2H3Cl+124.8KJ/mol
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乙炔与氯化氢在氯化汞催化剂作用下生成氯乙烯的反应式？
参考答案：
C2H2+HCl→C2H3Cl+124.8KJ/mol
| 阅读理解。 |
| Jack is six years old. He has no sisters. But he has a brother. His brother's name is Mike. Jack likes eating apples, oranges and bananas. Sometimes he eats some of his brother's apples. And his brother hits him for that. He doesn't like Mike. This September he is going to school. It's the ninth day at school. Jack and his classmates are having a new lesson. "Jack, how much is five minus three, please?" "It's…it's…" "Now, listen to me," says the teacher, "If your sister has five apples, and you have eaten three of them…" "But I have no sisters." Jack says. "Oh, sorry. But do you have any brothers?" "Yes." "Now, if your brother has five apples, and you have eaten three of them, tell me how…?" "He'll certainly give me a good beating" Jack says quickly. |
| 1. How many brothers and sisters does Jack have? |
[ ] |
| A. One brother and one sister. B. One brother and two sisters. C. Only one brother. D. No brothers and no sisters. |
| 2. Why does Mike sometimes hit Jack? Because ______. |
[ ] |
| A. Jack often hits Mike B. Jack doesn't like eating fruit C. Jack doesn't do his homework D. Jack often eats some of Mike's of apples |
| 3. Why can't Jack answer his teacher's question? Because ______. |
[ ] |
| A. he has no sisters B. he has no brothers C. he doesn't understand his teacher's question D. he has no apples |
| 4. If you have five apples, you have eaten three of them, how many apples remain (剩下) ______. |
[ ] |
| A. two B. three C. four D. one |
| 5. When does the story happen (发生)? |
[ ] |
| A. In October. B. On the ninth day at school. C. In a new lesson. D. At school. |