等物质的量的主族金属A、B、C分别与足量的稀盐酸反应，所得氢气_爱下问搜题

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问题选择题

等物质的量的主族金属A、B、C分别与足量的稀盐酸反应，所得氢气的体积依次为VA、VB、VC，已知VB＝2VC，且VA＝VB＋VC，则在C的生成物中，该金属元素的化合价为 [ ]

A、＋1

B、＋2

C、＋3

D、＋4

答案

答案：A

单项选择题

合理应用中药或中成药必须根据正确的（）。

A.施治

B.辩证

C.四诊

D.把脉

单项选择题

A Trip to the Forest

One day Bob took two of his friends into the mountains. They put up their tents(帐篷) and then rode off to a forest to see how the trees were growing.
In the afternoon when they were about ten kilometres from their camp(营地), it started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp,and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp
Bob had an idea. The horses! Let the horses take them back! But what would happen if the horses took the road to his house That would be a trip of thirty-five kilometres 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. Bob looked around. What was that under the tree It was one of their tents!

Bob’s parents were waiting anxiously for them in his house.
[A] Right. [B] Wrong. [C] Doesn’t say.