地震活动性指在一定时间、空间范围内地震发生的（）、频度、（）和空间等方面的分布规律和特征。
参考答案：强度；时间
What worried the child most was _____________ to visit his mother in the hospital.[ ]
A. to his being allowed
B. his not being allowed
C. not his being allowed
D. not his allowed
常用于麻醉期体温监测的是（）
A.腋窝温度
B.直肠温度
C.鼻咽温度
D.食管温度
E.耳鼓膜温度
