证券经纪人可以利用投资者账户买卖证券，只要在投资者需卖出时能满足其要求。 ( )

. In our class, when the bell rang and the teacher closed his book, it was a ______for everyone to stand up.

A．mark

B．chance

C．signal

D．measure

When he was a boy, he used to go there and watch _____.

A．to repair bicycles

B．bicycles to be repaired

C．bicycles being repaired

D．repairing bicycles

下列方法中，哪一项能在灭菌法中应用（）

A.高温

B.紫外线

C.电离辐射

D.戊二醛

E.新洁尔灭

男患，33岁，3天前晨起感觉左眼闭合不全、口角向右歪，进食滞留在左颊部，今日感觉左耳部疼痛，查体：左侧周围性面瘫征，左侧舌前2/3味觉丧失，左侧外耳道小疱疹，触及疼痛。病变部位最可能在（）

A.脑干

B.右侧面神经管内

C.左侧膝状神经节

D.左侧面神经管内

E.左侧茎乳突孔内