定群研究，又可称为（）
A.队列研究
B.现况调查
C.病例对照调查
D.临床随访研究
E.现场研究
参考答案：A
When they got there,they found the people suffering the storm were________food and water supplies.[ ]
A. in want of
B. in praise of
C. in honour of
D. in place of
He ________ from other people in that he always looked farther ahead in his work．
A．agreed
B．disagreed
C．differed
D．improved
