问题
单项选择题
地下水中分布最广、含量较多的4种阳离子和3种阴离子是（）。
A.A
B.B
C.C
D.D
答案
参考答案：A
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地下水中分布最广、含量较多的4种阳离子和3种阴离子是（）。
A.A
B.B
C.C
D.D
参考答案：A
| 从方框中选出能填入空白处的最佳选项。 | |
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| A:Nick. Congratulations on winning the marathon this time! B: 1 . It's hard for me to win this time. A:You are right. But 2 ? B:For over 2 hours. A: 3 ? B:No, I got one last year. A: 4 , Nick. Do you run every day? B:Yes, I do.I have been running since l was a school boy. At that time I got my first sneakers on my seventh birthday from my father. A: 5 . But who taught you to run? B:I ran all myself at first, then my father helped me a lot. 1.______2.______3.______4._____5.______ |