单项选择题
A．The President and First Lady. B．Ed Wilson. C．Scientists in California. D．Jan Singer.
A．the results of the two matches B．the number of the teams which played last night C．how many wins the BBS has had altogether D．the Wingers has had one win and four defeats recently
A．to give better condition to their patients B．in order to improve patients' health C．to make patients smile D．to prove smile and laughter have the same effect