( )（2）下午老师上课时，可以说：
A.Good morning , class. B. Good afternoon,class.
Liu Tao is _________ younger than his twin brother Liu Xiang.
A. 15 minutes B. 15 years C. 15 days
________ your sister shorter than you ?
A. Is B. Are C. Does
What subject _______ you good _______?
A. are, at B. do, in C. are, in
Su Haithe long jumpSu Yang.
A.does well in,than B.is better in,than C.is better at ,than
Look!The dragonflythan the bee.
A.fly higher B.flies high C.is flying higher