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2C(g)＋D(g)，在一定温度、体积固定的密闭容器中进行，下列叙述中能说明上述反应达到平衡状态的是A．混合气体的密度不随时间变化而变化
B．单位时间内每消耗3 mol B，同时生成2 mol C
C．D的物质的量分数在混合气体中保持不变
D．B、C、D的分子个数之比为3∶2∶1 查看习题详情和答案>>
1.take (反义词)____________ 2. I’m（完全形式）_________
3. does not（缩略形式）_________ 4. you（形容词性物主代词）_________
5. two( 同音词) __________ 6. photo (复数)
7. have(第三人称单数) 8. we (宾格)
9. these (单数) 10. father (对应词)
查看习题详情和答案>>情景反应，配对
|
1.Would you like something to drink? 2.What time shall me leave? 3.How are you? 4.Your CD is very nice. 5.How often does your uncle drink? |
E.Sometimes. |
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John: Your name is Bella, 1 ?
Bella: Yes, it is.
John: You're the only child in your family, 2 ?
Bella: Yes, I am.
John: You live with your parents, 3 ?
Bella: Yes, that's right.
John: You lived in the countryside before, 4 ?
Bella: Yes, I did. My family came to live in this city a year ago.
John: Your parents were both farmers before you moved there, 5 ?
Bella: No, only my mother was.
1. 2. 3. 4. 5.
（从方框中选择恰当的句子完成下面的对话，并将符合题意的选项用2B铅笔涂在答题卡的相应位置上。其中有两项多余。每小题1分，共5分）
| A. Have you ever been here before? B. It’s beautiful. C. How long have you been in Dandong? D. Have a good time! E. The seafood and the noodles are really delicious. F. What places have you visited? G. Where will you go then? |
B: Yes, it is. Do you work here in Dandong?
A: No, I don’t. I’m just a tourist.
B: 小题1:
A: Yes, I have been here three times.
B: 小题2:
A: I have visited the Yalu River Bridge, Jinjiang Park and Mount Fenghuang.
B: What do you think of Dandong?
A: 小题3: It has changed a lot in the past few years.
B: Do you like the food here?
A: Yes, I do. 小题4: I like them very much.
B: So do I. Here comes the bus! 小题5:
A: Thank you. Bye-bye!
B: Bye!