不属于根尖囊肿囊液内容物的是
A．蛋白质
B．脱落上皮细胞
C．角质
D．电解质
E．水分
参考答案：B
The stamps, once ________, will be very popular with stampcollectors. [ ]
A. being printed
B. printing
C. to print
D. printed
Well, the dress will make you ________ in a crowd.
A．sort out
B．stick out
C．come out
D．stand out
