胎儿头皮与颅骨间距增宽呈低回声，躯干、四肢、皮肤与皮下组织分离呈双线样，横切呈双环征

中国民间文艺研究会1958年制定出“（），重点整理，大力推广，（）”的民间文学工作方针。

下列对免疫概念的叙述正确的是[ ]

A．免疫是人体的一种生理功能

B．免疫使人体对任何疾病都能抵抗

C．免疫是后天得到的

D．计划免疫是获得免疫力的惟一途径

NSAID急性胃炎主要发病机制（）。

A.胃黏膜微循环障碍

B.抑制前列腺素合成

C.亲脂性，破坏黏膜屏障

D.黏液屏障分泌减少

E.胆盐、磷脂酶A和其他胰酶破坏

W: Carol told us on the phone not to worry about her. Her left leg doesn’t hurt as much as it did yesterday.
M: She’d better have it examined by a doctor anyway. And I will call her about it this evening.
Q: What does the man think Carol should do().

A. See a doctor.

B. Stay in bed for a few days.

C. Get treatment in a better hospital.

D. Make a phone call to the doctor.

全程运量计划包括装发邮件总量和各局接卸量。