列车上由列车长负责检验车票,检票次数原则上多少公里一次()
A.400km
B.500km
C.600km
D.300km
参考答案:A
30. —I _________ his telephone number.
—I have his number, but I _________ to bring my phone book.”
A.forget, forget
B.forgot, forgot
C.forgot, forget
D.forget, forgot
直肠指检用于判断____,有反应时可感觉到____,代表____。