男性，62岁，胃溃疡病史3年，一年来上腹痛发作频繁，无规律，体重减轻。患者拒绝手术治

---Must we leave the classroom now?

---No, you _____. You _____ leave after the bell rings.

A．mustn't; are allowed to

B．don't have to; might

C．needn't; can

D．can't; are supposed to

I sent a big bunch of flowers to the nurse as an ________ of thanks for her taking good care of my grandpa in the nursing home.

A．attitude

B．impression

C．appreciation

D．expression

气的上升运动太过，称为（）。

A.气滞

B.气逆

C.气不降

D.气脱

E.气郁

（）隧道养护作业应封闭隧道内整条作业车道，下游过渡区宜布置在隧道出口外。

A、中、短

B、特长

C、长

D、全部

下列关于MRI显示室间隔缺损的描述，正确的是

A．显示膜部的缺损较好

B．显示肌部的缺损较好

C．显示漏斗部的缺损较好

D．可显示伴随畸形如大血管转位

E．较超声心动图不敏感