投资者在房地产上所拥有的权益通常在50年以上。( )
参考答案：错
You'll have an English exam tomorrow. You'd better ____ watch TV this evening. [ ]
A. to not
B. not to
C. don't
D. not
虚里搏动迟弱者，可见于（）
A.气胸
B.悬饮
C.鼓胀
D.心阳不足
E.心肺气绝
