Millie is a little fat. She wants to join a body club in the summer holiday. She has found some information about a body club.

小题1:What can Millie do in the club?

A．Playing basketball.

B．Swimming.

C．Playing chess.

D．Hiking.小题2:Which is TRUE according to the passages?

A．If you join the club, you can get two free T-shirts.

B．It’s a good way to fight the fat and keep fit if you join the club.

C．You can contact the club on 8366 6888 for more information.

D．The club will offer one week free membership if you join it in two weeks.小题3:The two passages are ______.

A．letters

B．diaries

C．news

D．advertisements

a、b两种单色光以相同的入射角从某种介质射向真空，光路如图所示，则以下叙述正确的是

A．在该介质中a光的传播速度大于b光的传播速度

B．用同一干涉装置可看到a光的干涉条纹间距比b光窄

C．a光的全反射临界角小于b光的全反射临界角

D．a光若能使某金属发生光电效应,则b光也一定能