【判断题】日常熟悉的风云雷雨现象发生在大气底层十多千米的高度以上。()
【简答题】A lot of people were standing around when the police (arrive) ______.
【单选题】I couldn't walk very fast because a lot of people were _______.
【简答题】翻译 4. He noticed that a lot of people were using mobile phones, and he saw a business opportunity.
【单选题】The combining form " thorac/o " means .
【判断题】高云云底高度通常在6000米以上,全部由细小的冰晶组成。