(-2)20+(-2)21的值是( )
A.-2
B.(-2)41
C.-220
D.0
原式=220-221
=220(1-2)
=-220.
故选C.
患者,女,48岁。烦躁失眠一年余,容易受惊,口苦泛恶,胸胁胀满,舌红苔黄腻,脉滑数。此属()
A.心肾不交
B.心脾两虚
C.胆郁痰扰
D.肝火炽盛
E.心火上炎
27. ______ he did was quite right.
A.That
B.Which
C.What
D.Who