单选题：听录音，回答以下问题：The speakers are mainly talking about __________

题目内容：

听录音，回答以下问题：
The speakers are mainly talking about __________ A．a speech
B．a radio program
C．a campaign plan
D．a chemistry class

参考答案：

答案解析：

请在第(41)处选择正确答案_______

请在第(41)处选择正确答案_______A．inference B．conclusion C．summary D．investigation

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What is the way that the computer viruses infect the computer systems?A．They in

分类：专四题型：单选题