单项选择题


Questions 13 to 15 are based on the conversation you have just heard.

A．Oil.
B．Wood.
C．Natural gas.
D．Coal.
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单项选择题
A．To install a microelectronic wave detector.B．To raise the alarm.C．To install cell phone signal shielding facilities.D．To ask students to switch off the handsets.
A．To install a microelectronic wave detector.
B．To raise the alarm.
C．To install cell phone signal shielding facilities.
D．To ask students to switch off the handsets.
单项选择题
A．Having a break.B．Continuing the meeting.C．Moving on to the next item.D．Waiting a little longer.
A．Having a break.
B．Continuing the meeting.
C．Moving on to the next item.
D．Waiting a little longer.
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