救生员在进行双人解脱时，应先确认两个人中谁是溺水者。
参考答案：对
In order to find the missing child, villagers _______ all they can over the past five hours.
A．did
B．do
C．had done
D．have been doing
扶桑9月下旬入温室，室温保持在（）左右为宜。
A.15℃
B.20℃
C.25℃
D.30℃
