A：一个苹果的质量约为5 kg
B：人步行的速度约为10 m/
C：现在教室内的温度约为60℃
D：乒乓球台的高度约为80 cm
①取用粉末状固体常用 ____
②量取10mL液体药品用 ____
③称量18.8g的食盐用 ____
④给固体药品加热用____
⑤吸取和滴加少量液体时用 ____
某商品涨价20%后欲恢复原价，则必须下降的百分数约为（ ）
_____ would you like? I like fish.
一 Many students don't know _____ stress and become worried.
一 I think they should communicate more with their parents.
