【单选题】在Windows环境下,组合键 +X的常用功能是( )。
【简答题】金属汞易挥发,吸入体内易引起慢性中毒,一旦把汞洒落在桌面或地上,必须尽可能收集起来,并用( )盖在洒落的地方,使汞变成不挥发的( )。
【单选题】Lily loves to listen to music and draw because ____.
A.
it helps her to express herself
B.
it helps her to have fun
C.
it is a good way of killing time
【多选题】依观赏部位分类,可以将花卉分为 ( )等。
【单选题】Listen! Lily_____ in the next room. [ ]