24h体温波动于高热和正常之间是：（）
A.回归热
B.间歇热
C.稽留热
D.消耗热
E.弛张热
参考答案：B
My sister, an inexperienced rider, was found sitting on the bicycle _____ to balance it. [ ]
A. having tried
B. trying
C. to try
D. tried
医学原虫是指（）
A.寄生于人体的致病性原虫
B.寄生于人体的致病性和非致病性原虫
C.寄生于人体的致病性原生动物
D.寄生于人体的致病性和非致病性原生动物
E.寄生于人和动物的致病性原虫
