A、  B、  C、  D、  A (B)究竟是conductor还是passenger根本无法区分。(C)一听到主语(Many people)就可以确定是错误选项。(D)如果不知道pull out of的意思

(A) The woman standing is playing a cassette player.
(B) The woman is pointing at the whiteboard.
(C) The woman is giving a presentation.
(D) They are concentrating on their studies.

(A)  The train has stopped at the station.
(B)  The conductor is checking the passengers.
(C)  Many people are waiting for the train on the platform.
(D)  The train is pulling out of the station.