21．--- What does typical traditional tea – house in Chengdu look like?
--- Usually it is in the open air, and they serve tea in covered tea – sets.
A．a; / B．a; the C．the; the D．/; /
22．--- I didn’t do well in math .
--- I did you; so we are half and half.
A．not worse than B．no worse than C．not better than D．no better than
