哪种情况下左右两侧肺的通气大致相同()
A.清醒正常人坐位
B.清醒正常人仰卧位
C.清醒正常人直立位
D.清醒正常人侧卧位
E.上述均不对
参考答案:B
生活中的下列物品,用合成材料制作的是
A.塑料洗衣盆
B.纯羊毛衣服
C.铝合金门窗
D.景德镇瓷器
Sarah had her purse stolen the day before yesterday when she was knocking about in a park, ______________?
A.wasn’t she
B.weren’t they
C.hadn’t she
D.didn’t they