1.
(2021·成华模拟)
As we don't know how long the COVID—19 outbreak will last, we still should ________to protect us from infecting in our daily life.
①stay away from crowds
②stay up late at night
③wear medical masks
④wash hands properly
⑤help the confirmed patients
A . ①③④
B . ②③⑤
C . ①④⑤