婴幼儿呼吸方式的特点是（）.
A.以胸式呼吸为主
B.以腹式呼吸为主
C.胸式呼吸和腹式呼吸两种方式并重
D.既不属于胸式呼吸也不属于腹式呼吸
参考答案：B
— How far are you cycling each day?
— ____. It will depend on the weather. [ ]
A. It's my pleasure
B. It's hard to say
C. Take care
D. Good luck on your journey
何谓“硼—铝反常”现象？
