回购协议的期限通常为隔夜或几天。( )
参考答案：对
善于温胃止呕的要药是（）。
A.麦冬
B.生姜
C.姜黄
D.黄连
E.芦根
Which is ________ to learn, fishing or swimming? [ ]
A. easy
B. easier
C. the easier
D. more easily
