内眦赘皮
参考答案：内眦部垂直方向上的皮肤皱褶。
假设在关系模式R（U）中，X、Y、Z都是U的子集，且Z=U-X-Y。若X→→Y，而Z=，则称X→→Y为【 】。
By ______ part in "Chinese Bridge" programs, students in Chongqing got a great chance ______ friends
with students from all over the world. [ ]
A. take; to make
B. taking; make
C. to take; to make
D. taking; to make
