流行性腮腺炎的好发年龄
A．老年人B．无明显年龄选择C．婴儿期D．中年人E．5～15岁
参考答案：E
—Maggie，I really love your handwriting．
—________．
A．I practice every day
B．Thank you very much
C．No，I don’t think so
D．Well，it’s not good enough
煤层巷道掘进时有哪些预防突出事故的措施？
