吃苹果和橙子哪个更对人体有益?()
A.苹果
B.橙子
参考答案:A
解析:英国诺丁汉大学研究发现,每周吃苹果超过5个,心肺功能会得到明显改善,气喘和哮喘症状也大大减少。
I'm amazed to hear from my school teacher again.________, it is ten years since we met last.[ ]
A. In a word
B. What's more
C. That's to say
D. Believe it or not
气体产生阻塞流的原因?