从外表上看，中年人的衰老标志在40岁或50岁左右较为明显。 ( )
参考答案：对
AIDS is said _______ the biggest health challenge to both men and women in that area over the past few years.
A．that it is
B．to be
C．that it has been
D．to have been
《中医药条例》中明确国家发展中医药的方针是（）。
A.全面发展中医药
B.优先发展中医药
C.保持中医药特色
D.中西医并重
E.西医为主，中医为辅
