This is a farm.It is____and warm today.I can see a____and her three children,three____,two____,a____and a____on the farm.There is a____on the left.Behind the farm there are three high____.In the sky there are____and ____.
绿色植物的光合作用可用式子表示为:二氧化碳+X 有机物+氧气.式子中“X”表示的物质是( )
滴有酚酞的Ba(OH)2溶液分别与下列各物质恰好完全反应后,溶液仍显红色的是( )