冷凝管的回流水是从下口进上口出，反应结束先停止加热再停止通水。
A. 对
B. 错
__________ you follow the news every day, you won’t lose touch with the time.
A. get along with
B. as long as
C. as soon as
Now, a ________ computer can work out all the data in a very short time.
A. single
B. one
C. twin
Our team is working on a new __________ of safer skateboards.
A. gene
B. generation
C. grade
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