A
根据短文内容，选择正确的答案。

()1. Why can't Alex and his classmates join the school's running club?
A. The teacher refuses to train them.
B. The club is full now.
C. They have no free time.
()2. What can Mr Lee teach the club members?
A. How to win running races quickly.
B. How to warm up and run safely.
C. How to raise money for the club.
()3. We can infer that Alex .
A. doesn't want to do homework after school
B. hopes more classmates will join the club
C. plans to hold races in the nearby park
()4. What is Alex's purpose in selling old sports clothes?
A. To get money for club supplies.
B. To make the club more interesting.
C. To win small prizes for members.
()5. What's the main idea of the passage?
A. Asking Mr Lee to help with running training.
B. Telling classmates about a school running club.
C. Inviting classmates to join a self-made running club.

1.B 2.B 3.B 4.A 5.C

1. 从文章第一段原文“I'm sorry to say the school's running club is full, so we can't join it this term.”可知，Alex和同学没法加入学校跑步俱乐部的原因是俱乐部名额已满，对应选项B。
2. 从文章第二段原文“He has rich experience in running and will teach us how to warm up properly and run without getting hurt.”可知，李老师会教大家正确热身、安全跑步不受伤，对应选项B。
3. 选项A错误，文中提到安排的跑步时间不会占用写作业的时间，说明Alex重视写作业；选项C错误，文中只提到周末可以去附近公园慢跑，没有说要在公园办比赛；从Alex邀请同学参与俱乐部、让大家反馈意向的内容，可以推断出他希望更多同学加入这个俱乐部，对应选项B。
4. 从文章第三段原文“We'll also sell our old sports clothes to raise money for the club's first-aid kits and soft running socks.”可知，卖旧运动服是为了给俱乐部的急救包、跑步袜这类俱乐部物资筹钱，对应选项A。
5. 全文是Alex发给同学的邮件，说明学校跑步俱乐部已满，提议大家一起创办属于自己的课后跑步俱乐部，介绍了俱乐部的相关安排，邀请同学们加入，对应选项C。