3．如图在Rt△ABC中，∠C=90°∠B=30°，AB=2，

　 则AC=　　 。

2．=　　　　 　。

1．在实数 ，，　 　， ， 　中是　　　　　 无理数 。

4. C。细节题。根据文章最后一句可推知此题答案为C。

3. A。推断题。根据第2段最后一句及第3段第1句可推知此题答案为A。

2. D。细节题。根据第2段最后一句Unprepared for such a dangerous journey可推知此题答案为D。

1. B。细节题。根据第1段中的 But what is unique about this shoe is where it was found. It was discovered on the Checkout Pass, the famous trail…可推知此题答案为B。

4. No matter what happened to the woman who owned the shoe, _______.　

A. she must have lived a happy life

B. she certainly dropped the shoe on purpose

C. her adventurous spirit is definitely admired

D. her other shoes were equally fashionable

[答案与解析]本文由在Alaska州博物馆所陈列的一只旧鞋而引出的对当时情况的介绍及表达了对这只鞋的主人敬佩之情。

3. The Canadian government made gold seekers bring one year’s supplies with them so that _______.

A. they would not die of hunger and cold

B. the army would have enough food for fighting a war

C. they would change these goods with the Eskimos

D. the supplies would make Alaska rich

2. According to this passage, many people who went to Alaska _______.　

A. eventually became millionaires 　　　　　　　 B. brought with them many shoes

C. had conflicts with the Eskimos 　　　　 D. were not properly equipped