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
