问题
单项选择题
低氧燃烧时，产生的（）较少。
A.硫
B.二氧化硫
C.三氧化硫
答案
参考答案：C
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低氧燃烧时，产生的（）较少。
A.硫
B.二氧化硫
C.三氧化硫
参考答案：C
| 从方框中选择适当的句子补全对话。 | |
B: My mother is ill. She's in hospital. A: I'm sorry to hear that. 1 B: I wanted to ride my bike, but it's far. So I want to take a taxi. A: 2 B: About 10 kilometers. A: 3 B: It takes about 30 minutes. A: 4 B: I'll stay there for 3 hours. A: 5 B: I'll come back this afternoon. A: All right. If you have any questions, call me, please. 1._____2._____3._____4._____5._____ |