禽类中（）类的身体特点是身体一般短小，翅翼不大，嘴小脖子短。
A、鸟
B、家禽
C、阔翼
D、雀
参考答案：D
so various views about the matter,it is hard for him to make a decision.
A．Being
B．To be
C．There being
D．There to be
一般来说，脑梗死在CT上表现出密度降低的时间是梗死后（）
A.3h
B.6h
C.9h
D.12h
E.24h
