____ ____ ____ an orange?
It's black and white.It has a short tail.It's a .
实验装置
实验步骤及操作
实验现象
①将注射器1中的溶液推入充有CO2的瓶中
气球鼓起
②…
注射器3中无明显现象
③将注射器2中的溶液推入瓶中
溶液中有气泡产生,气球变瘪
④向外拉注射器3
澄清石灰水变浑浊
It took us half an hour ____ (find) out the cost by train.
What are you going to ____ (do) on sports day?