Don't be ____ (暴露于) to the strong sunlight, which may damage your skin.
某市一棉花店突发大火,消防人员用高压水枪喷水灭火,水在灭火中的主要作用是( )
口算.
15×2=____
28×2=____
300×20=____
10×500=____
17×3=____
16×5=____
200×40=____
20×90=____
What's the matter with you?