抗战时期，全国的对外贸易和金融中心是
A．上海
B．广州
C．重庆
D．武汉
答案：C
考查地方历史，重庆是抗战时期去昂过对外贸易和金融中心，答案选C。
As we all know, it was ____ that resulted in the terrible car accident. [ ]
A. because of her carelessness
B. her being careless
C. because she was careless
D. she was so careless
简述应如何理解作战的概念？
