单项选择题
A．New trees are not looked after properly. B．Many trees have been cut down by man. C．Man has not paid enough attention to planting trees. D．All of the abov
A．of the celebrations B．they are important C．there are special ceremonies D．societies share common characteristics
A．a good place to land at by aeroplane B．a good place to fly over C．a good place to fly past D．a good place to live in