每个账户的用途和结构都直接或间接地依存于账户的经济内容。（）
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Match the Chinese explanations with words and phrases.
S7-300PLC通电后，CPU面板上“BF”指示灯亮，表示（）。
A. 程序出错
B. 通信接口总线故障
C. 系统错误
D. 输入输出模块故障
What is the main reason that the Climate Train group traveled by land?
A. To make less pollution
B. To save money
C. to learn about other cultures
Was the Climate Train group happy that they chose to travel by land?
A. no, They will take a plane next time.
B. Yes. They were happy, though it was sometimes difficult.
C. Yes. They were happy, though it was an easy way to travel.
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