—Are ____ green beans?
—Yes, they are.
A:these
B:the
C:that
A
Linda's Phone Book
Name:Peter Green
Phone Number:299—0022
Name:Todd Smith
phone Number:266—8800
Name:Cathy Brown
Phone Number:255—9984
Name:Dale Miller
Phone Number:225—5773
根据材料内容判断正误。
定义A-B={x|x∈A且x∉B},已知A={2,3},B={1,3,4}。则A-B= ( )