In China, most schools are ________ schools. [ ]
A. mix
B. mixing
C. mixed
D. mixes
答案:C
—_____ is the letter from?
—It's from England.[ ]
A. Who
B. Where
C. What
D. Which
距当地800千米范围内有热带气旋,48小时内可能影响当地时,台风灯光信号为()。
A、白白白
B、白绿白
C、白绿绿
D、绿绿绿