急性上呼吸道感染需与________、_________、_________等鉴别。
参考答案：流行性感冒；急性传染病早期；急性阑尾炎
—Amy, could you please tell me something about David Beckham?
—Sorry. I know ______ about him.
A. everything B. something C. nothing
安全作业许可证有哪几种？
