下列属于有指导发现学习的是()。
BD
暂无解析
Inmostcountries,themetricsystemhasbeen_____forallmeasurement.
You'veonlygotaslightcold.You'll_____itinadayortwo.
曲线y=|x|与直线y=2所围成的平面图形的面积为（）
Theonly______(effect)waytodevelopinternationalskillsandperspectivesisthroughdirectinternationalexperience
Itisestimatedthat，currently,about50，000speciesbecome_____everyyear．