题目内容
A．The train is crowded.B．The train is late.C．The train is empty.D．The traifi is on tim
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Section A
Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.
(12)
【S12】
【B1】
The subjects of Dr. Sargent's study are ______.
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