题目

下列说法中错误的个数是（   ）（1）过一点有且只有一条直线与已知直线平行。（2）过一点有且只有一条直线与已知直线垂直。（3）在同一平面内，两条直线的位置关系只有相交、平行两种。（4）不相交的两条直线叫做平行线。（5）有公共顶点且有一条公共边的两个角互为邻补角。   A. 1个      B. 2个      C. 3个     D. 4个  阅读下面短文，从每题所给的四个选项中选出最佳答案. 　　During the summer holidays there will be a revised（修改过的）schedule（时刻表）of services for the students. Changes for dining-room and library service hours and for bus schedules will be posted on the wall outside of the dining-hall. Weekly film and concert schedules, which are being arranged（安排）, will be posted each Wednesday outside of the student club. 　　In the summer holidays, buses going to the town center will leave the main hall every hour on the half hour during the day. The dining-room will serve three meals a day from 7∶00am to 7∶00pm during the week and two meals from noon to 7∶00pm on weekends. The library will continue its usual hours during the week, but have shorter hours on Saturdays and Sundays. The weekend hours are from noon to5∶00pm. 　　All students who want to use the library borrowing services must have a new summer card. This announcement will also appear in the next week's student newspaper. （1）The main purpose of this announcement is to ________. [　　] A. tell students of important schedule changes B. tell students of new bus and library services C. show the excellent services for students D. ask students to renew their library cards （2）At which of the following times will the bus leave the main hall? [　　] A. 8∶00, 9∶00, 10∶00, 11∶00 B. 8∶30, 9∶30, 10∶30, 11∶30 C. 8∶30, 9∶00, 9∶30, 10∶00 D. 8∶00, 9∶30, 11∶00, 12∶30 （3）Times for films and concerts are not listed in this announcement because ________. [　　] A. they are not to be announced B. they are hard to arrange C. the full list is not ready D. the full list is too long （4）In the summer holidays, the library will have ________. [　　] A. no special hours B. special hours on weekdays C. special hours on weekends D. special hours both on weekdays and weekends （5）We may infer that during the summer holidays ________. [　　] A. the student newspaper will sell more copies B. there will be a concert or a film once a week C. many students will stay in the university D. no breakfast will be served on weekends