③The company trades mainly in furs and animal skins.

　　该公司主要从事动物毛皮的贸易。

　　④I'll trade my stamp collection for your model boat.

　　我想用我搜集的邮票换你的模型船。

　　4．The gorge narrows to 350 feet as the river rushes through the two­mile­high mountains. (P42)

　　江水在两英里高的峰峦间奔流，峡谷狭窄处只有350英尺。

　　★narrow vi.& vt.(使)变窄，(使)缩小adj.窄的，狭窄的；范围小的；勉强的

　　①The approach to the house was a narrow path.

　　通往这所房子的路是一条狭窄的小径。

　　(1)a narrow victory　险胜

　　a narrow escape 死里逃生

　　narrow ... to ... 把......局限在......之内

　　(2)narrowly adv. 狭窄地；勉强地

　　②He had a narrow escape when his car skidded on the ice.

　　车在冰上打滑，他险些出事。

　　③She narrowed her life to a certain circle of friends.

　　她把她的生活局限在一个特定的朋友圈中。

　　④She narrowly (narrow) escaped injury.

　　她险些受伤。

　　5．"Oh，well，" my friend said, "at least we have two more left."(P42)

　　"哦，算了，"我朋友说，"至少我们能看见另外两个峡谷。"

　　★at (the) least至少；起码；无论如何

　　①Rooms will be cleaned and bedcovers changed at least once a week.

　　一周至少一次打扫房间，更换铺盖。

　　in the least　　　一点，丝毫

　　not in the least＝not at all 一点也不

　　last but not least 最后，但同样重要的是

　　at (the) most 至多，不超过

　　②I don't trust that man in the least.

　　我一点也不信任那个人。

　　③I can pay you 10 pounds at (the) most.

　　我最多付给你10英镑。

　　6．The next day we went through the big gorges on the Yangtze River. (P42)

　　第二天我们穿过了长江的大峡谷。

　　★go through经历，经受；仔细检查，审查；查阅，浏览；完成；通过，穿过

　　写出下列句中go through的含义

　　①I always start the day by going through my email.浏览

　　②Let's go through the arguments again.仔细检查

　　③She's gone through a bad patch recently.经历

　　④Go through the arch and follow the path.穿过

　　go ahead　 请吧，说吧，做吧

　　go down 下降，下跌

　　go out 出去；(灯)熄灭

　　go over 仔细检查，复习

go without　没有(某物)也行