我国领土绝大部分位于[ ]
A．热带
B．北温带
C．南温带
D．北寒带
答案：B
发展中国家向发达国家投资的比重逐渐（）。
I was halfway back to the hospital where the doctor was working______Susan caught up with me．
A．when B．while C．until D．though
