佳创兴2015
发表于 2020-11-22 19:52:11
Land and water. ocean.valley. plain. forest. rainforest.hill. mountian. 机械制图，组合体。
zhangxiuguo
发表于 2020-11-22 20:19:44
day day up
佳创兴2015
发表于 2020-11-23 19:24:30
How does Earth change. flood.drought. erosion.weathering.
佳创兴2015
发表于 2020-11-25 14:22:27
11.25Heat is a kind of energy. Lamp. bur. fire. Linght is a kind of energy. light can come from the sun , candles, flashlight, streerlingt. light can pass through glass. dark. shadow.
佳创兴2015
发表于 2020-11-28 14:54:47
Sound. volume. whiper. pitch. vibrate. yell.
佳创兴2015
发表于 2020-11-29 21:57:35
11.29 Power plants make Electricity. The wire. The cord .The outlet. The lamp.