Write the word "English" ______ the blackboard.[ ]
A. at
B. with
C. on
答案：C
设全集U={1，2，3，4，5}，集合S与T都是U的子集，满足S∩T={2}，(CUS)∩T={4}，(CUS)∩(CUT)={1，5}，则有[ ]
A．3∈S，3∈T
B．3∈S，3∈CUT
C．3∈CUS，3∈T
D．3∈CUS，3∈CUT
