单项选择题

W: This machine has so many buttons.I can’t figure out which one makes it run.
M: You’d better read the instructions first Pressing the buttons at random may cause the machine to break down.
Q: What would the woman most probably do first?()

A.Read the operational manual.
B.Try the buttons one by one.
C.Make the machine run slowly.
D.Ask her instructor for advice.