图中“●”和“ ”表示两种不同元素的原子，下列方框中表示混合物的是（ ）
- ____________ will you finish your high school? In about two years. A. How long B. How often C. How soon D. How much
You must _______ what Joseph tells you, for he is good at making good stories. A. discount B. defend C. deposit
在两个容积相同的容器中，一个盛有HCl气体，另一个盛有H2和Cl2的混合气体。在同温同 压下，两容器内的气体一定具有相同的( ) A．原子数
有一真空瓶质量为，该瓶充入空气后质量为。在相同状 况下，若改为充入某气体A时，总质量为。则A的相对分子质量是（ ） A．×29 B．
下列几种生物中，遗传物质与其他几种不同的是 A．T2噬菌体 B．大肠杆菌 C．烟草花叶病毒 D．豌豆
The soldiers cheered as the train crossed the border into Wisconsin.It had been a long trip from the south back to their homes in the north. One of the men had a large red scar across his
，则
在
上的值域是 . 
