有头疽的虚证有（）（）之分，分别好发于老年（）之人和老年（）之人。
参考答案：阴虚火炽证；气虚毒滞证；瘦弱；肥胖
We _____ in this pool when we were young, but now it _____ fish. [ ]
A. are used to swim; used to keep
B. are used to swimming; is used to keep
C. used to swim; used to keep
D. used to swim; is used for keeping
食品的腐败变质的过程主要是由于（）繁殖产生各种分解酶，使食品中的（）被分解成有毒有害物质的结果。
