产生脑电活动节律的主要部位是()。
A.新皮层
B.丘脑
C.脑干
D.苍白球
E.红核
参考答案:B
-Excuse me, does Mr Smith’s son live here?
-He _________ be here, but he has moved.
A.has to
B.used to
C.tried to
D.happened to
默写古诗。
, 。