正常新生儿的呼吸特点是（）
A.出生前没有呼吸运动
B.呼吸节律规则
C.呼吸频率较成人慢
D.以腹式呼吸为主
E.呼吸中枢发育完善
参考答案：D
Mrs. White found her husband ___by letters and papers and___ very worried.
A．surrounding ; looked
B．surrounded ; looked
C．surrounding; looking
D．surrounded ; looking
Mike often helps his mother ______________ the meals. [ ]
A. do
B. cook
C. make
