问题 选择题

下列有关金属腐蚀与防护的说法,正确的是[ ]

A.纯银器表面在空气中因发生电化学腐蚀渐渐变暗

B.当镀锌铁制品的镀层破损时,镀层不再对铁制品起保护作用

C.在空气与水面交接处的钢柱,比在水下部分的钢柱容易腐蚀

D.可将地下输油钢管与外加直流电源的正极相连以保护它不受腐蚀

答案

答案:C

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March Break Leadership Camp

The aim of this FREE program is to develop an awareness of race relations, diversity, an equal issue for students in Grades 6-8.

Place: The Central Library Room

Time: March 16&17, 2009 from 9:00 am to 3:00 pm

Pick up and hand in registration forms(报名表) at the Central Library. All forms must be handed in by March 6th. Space is limited.

Please send any questions related to the program to Becky George, the Public Library 905-831-6265 ext 6230 or email: pickering-younity@hotmail.com

Free Your Space……Free Your Mind

At the Central Library: Wednesday, May 13th from7:00 pm to 8:30 pm

This time management course will help you to create more balance and time in your life. In today’s increasingly stressful times, it is becoming more difficult to spend quality time with family and friends. This course will provide positive solutions and strategies (策略) to achieve peace.

Book Club for Teens

At the Central Library: Every 2nd Thursday at 7:00 pm

Do you enjoy reading? Part of the pleasure of reading comes from meeting with others to discuss characters, plots or style. Come to trade ideas and questions, and make new friends.

This program is currently full but for more information, please call 905-831-6265 ext 6232.

Computer Training

Group computer classes for teens will be provided at the Central Library in March, April, and May. Registration starts at 9:30 am on Friday, March 6th for the March session; Friday, March 27th for the April session; and Friday, April 24th for the May session.

A valid(有效的) Public Library card is required for all computer training sessions. Call the Central Library for more information or to register, 905-831-6265 ext 6243.

Limit 10 participants(参加者) per class.

小题1: What do these four programs have in common?

A.They are held in the same place.

B.They are held at the same month.

C.All of them are free of charge.

D.All of them limit the number of participants.小题2:John is always in a hurry and not good at arranging his time. He should attend_________.

A.Computer Training

B.Free Your Space …..Free Your Mind

C.March Break Leadership Camp

D.Book Club for teens小题3: If you want to do computer studies, you need to ______.

A.register for each session a month in advance

B.find other students to form a group

C.go to the library to register by yourself

D.own a valid Public Library card

多项选择题