中等水平回声见于（）
A.肝实质
B.骨骼
C.胆结石
D.肌腱
E.血管壁
参考答案：A
经行情志异常，值经期出现下列哪些主症（）
A.烦躁易怒
B.情志抑郁
C.小腹胀痛
D.彻夜不眠
E.胸闷胁胀
The boy looks very sad. Let's go to _____. [ ]
A. cheer up him
B. cheer him up
C. look him up
D. look up him
