单项选择。
I big eyes and small ears.[ ]
A. has
B. have
C. had
D. am
答案:B
The timetable(时刻表) tells us __________________________every day.
A.when does the train arrive
B.when the train will arrive
C.when will the train arrive
D.when the train arrives
妊娠晚期,正常胎儿,羊水中不应含有()。
A.胎脂
B.胎粪
C.毳毛
D.脱落的上皮细胞
E.性激素