3.On a distant mountain was a sign in 20­foot characters. "Build the Three Gorges Dam, Exploit the Yangtze River，" it said.

远山上写着20英尺大的汉字："建造三峡大坝，开发长江资源"。 表示地点的介词短语放在句首，句子要采用完全倒装的形式。 On the top of the mountain stands_a_temple,_in which there are three monks.

山顶有座庙，庙里住着三个和尚。 　　

　　1．(教材P41)A lake is an area of water surrounded by land.

　　湖是由陆地围绕的一片水域。

　　surround vt.围绕；环绕

　　(1)surround sb./sth. with. sb./sth. 使某人(某物)包围某人(某物)

　　be surrounded with/by　　　 被......环绕

　　(2)surrounding adj. 周围的，附近的

　　surroundings n. 环境

　　①We stood at the edge of the lake，which is surrounded with/by trees.

　　我们站在湖边，这个湖的四周树木环绕。

　　②She likes to surround herself with beautiful things.

　　她喜欢身边有漂亮的东西。

　　③We lived in a house surrounded by trees, and most of the trees surrounding (surround) the house were pine trees.

　　我们住在一所被树木环绕的房子里，环绕在房子周围的树木大部分是松树。

　　2．(教材P41)Cliffs are the steep sides of mountains at the edge of a river or the sea.

　　悬崖是河边或海边的山的陡峭的那面。

　　at the edge of在......的边缘

　　①I heard the birds singing at the edge of the woods.

　　我听到林边的鸟儿在歌唱。

　　②Tom sat at_the_edge_of the bed，reading a storybook attentively.

汤姆坐在床沿上，专注地读着故事书。