题目

13.听第9段材料,回答第13至16小题.13.What is the woman doing?A.Doing a survey. B.Promoting a magazine.C.Advertising for travel agency.14.Which age group does the man belong to?A.The young. B.The mid-aged. C.The old.15.What are the man and his wife's common interests?A.Exercising and watching movies.B.Sailing and watching movies.C.Cooking and visiting friends.16.What is the probable relationship between the two speakers?A.Boss and clerk. B.Teacher and student. C.Interviewer and interviewee.15.如图所示.要使L1与L2并联应闭合开关S1、S3;若灯L1的阻值为10Ω,L2的阻值为20Ω,灯L1允许通过的最大电流为0.5A,灯L2允许通过的最大电流为1A,当只闭合开关S2时,在不损坏仪器的情况下,电源电压最大为15V.
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