近年来，抗生素的滥用致使很多致病细菌具有一定的耐药性．根据达尔文的进化论分析，耐药细菌越来越多的主要原因是（    ）

Tina goes __________ after __________ school at four thirty.

逆反心理是青少年一种常见的心理现象，如果处理不当，会造成亲子隔阖，导致种种不快。下列做法有助于克服逆反心理的是（  ）

C

    Next week is Family Learning Week and there will be many activities (活动) at schools in the city.

    There is a very interesting art class at Hadley School. Its name is "Paint with your parents". It's on Saturday, October 28th. It is for anyone with children under 16. It's a two-hour class it begins at 9:15 in the morning

    An interesting thing about this class is one of the teachers, a famous writer. Her name is J.P. Hayward She will read from her new book. Listening to her will give you ideas to use in your paintings.

    A family ticket (票) is $8. That's for four people. Anyone extra (额外的) has to pay (付费) $3.

    If you are interested in this class, please call Mr. Henry. The phone number is 456-3290. I hope you all enjoy Family Learning Week.

根据材料内容选择最佳答案。

一个质点正在做匀加速直线运动，用固定的照相机对该质点进行闪光照相，闪光时间间隔为1s，分析照片得到的数据，发现质点在第 1次、第2次闪光的时间间隔内移动了0.2m；在第3次、第4次闪光的时间间隔内移动了0.8m，由上述条件可知（　　）