急性呼吸窘迫综合征初期仅表现为______。
参考答案：呼吸频率加快，大于20次/分钟
_______ the children grew old, they became more and more _______ in science.
A．As; interested
B．With; interesting
C．While; interest
D．With; interested
A．①和②
B．②和③
C．②和④
D．①和④
