带下病的主要病因为
A.寒
B.热
C.痰
D.湿
E.虫蚀
参考答案:D
It was with great delight that I read in your February _____ the letter to the Editor written by Prof. Johnson.
A.issue
B.printing
C.magazine
D.copy
长颈鹿的颈很长,按照达尔文的观点,其原因是
A.变异朝着有利于生殖的方向发展的结果
B.繁衍后代的需要
C.代代经常使用,吃高处的叶子的结果
D.自然选择的结果