健美操的运动量可大可小，（）可难可易，（）可长可短，不受场地，器材，年龄等条件的限制。
参考答案：动作；时间
Sometimes we are asked _____ the likely result of an action will be.
A．that we think
B．what do we think
C．what we think
D．that what we think
确诊痢疾最可靠的依据是（）
A.典型脓血便
B.明显里急后重
C.大便培养阳性
D.免疫检查阳性
E.大便镜检发现大量脓细胞、巨噬细胞
