支气管哮喘病人PaCO2增高表示（）
A.没有临床意义
B.病情好转
C.病情严重
D.发作早期
E.呼吸性碱中毒
参考答案：C
根据句意补全单词中所缺字母，使补全后的句子通顺、合理。
l.—What colour is Ann's skirt?
—It's r____d.
2.We often play g____mes after school.
3.Put your r____ler and your pen in the pencil-box.
4.My parents work f____ ve days a week.
5.There are a lot of cars and buses in the str____t.
6.Don't open the wind____ . It's cold outside.
桅杆组装时，如倾斜于地面，其倾斜角一般不大于（）。
A.10°
B.15°
C.20°
D.25°
