问题补充：
—?
—I want to buy some cookies.
A. May I help you
B. Can you help me
C. What do you want
D. What’s the matter
答案：
(答案→)A. May I help you
B. Can you help me
C. What do you want
D. What’s the matter
解析：句意：——请问买什么？——我想要买一些饼干。A. May I help you 请问买什么？（商场用语）； B. Can you help me你能帮助我吗？C. What do you want 你想要什么？D. What’s the matter怎么了？
根据I want to buy some cookies.可知这是在商场买东西，因此售货员会先问May I help you。故选A。
