问题 选择题

根据以下陈述的知识,类推得出的结论正确的是

A.铝条在空气中燃烧生成的氧化物是Al2O3,则钠在空气中燃烧生成的氧化物是Na2O

B.铜在氯气中燃烧生成氯化铜,则铁在氯气中燃烧生成氯化铁

C.CO2与SiO2化学式相似,则CO2与SiO2的物理性质也相似

D.金刚石的硬度大,则石墨的硬度也大

答案

答案:B

题目分析:A、铝条在空气中燃烧生成的氧化物是Al2O3,而钠在空气中燃烧生成的氧化物是Na2O2,错误;B、氯气与变价金属反应使金属显高价,铜在氯气中燃烧生成氯化铜,则铁在氯气中燃烧生成氯化铁,正确;C、CO2与SiO2化学式相似,但CO2与SiO2的晶体类型不同,物理性质相差较大,错误;D、金刚石的硬度大,而石墨的硬度很小,错误。

判断题
阅读理解

阅读理解。

     One of the main decisions you must make when traveling is deciding where to stay. A good place to

stay can often make a holiday. Whether you are looking for a classy hotel or a night under the stars, we

can guide you through your different options.

     Bed and Breakfast

     An English invention, bed and breakfasts offer exactly what they suggest, a bed for the night and

breakfast in the morning. People who hate the anonymity of hotels but want more luxury than a hostel

often choose to stay at bed and breakfasts. "B&B's", usually someone's private home, are often found

in the countryside.

     Hostels

     For those traveling on a tight budget, hostels are the best accommodation option. Informal places

usually with a friendly youthful vibe(氛围), they offer dormitory beds for rent. Bathrooms are usually

down the hall.

     Remember to check reviews by previous guests online before you book your hostel.

     Couch Surfing

     An unusual but interesting option, couch surfing is a growing trend among young internationals. The

idea is that you become a member of the online couch-surfing community (www. couchsurfing. com)

and then when you travel, look up other members in that country and ask to stay on their couch (沙发).

Most hosts will suggest sightseeing trips and take you out in the evening, making it a great way to see

things that aren't in your guidebook. And remember, it may be free but don't forget to offer to buy your

host a drink or dinner.

     Camping

     Sleeping under the stars! For budget travelers staying at camping grounds is the cheapest way to

travel. The drawback is that you have to carry a tent with you. Camping grounds can be found across

Europe, America and Australia. However, if you intend on camping in busy cities, check first where the

nearest campsite is. More often than not, they are on the outskirts, which can mean lengthy bus rides into

town when you want to eat or see the sights.

1. Hostels are popular among budget travelers because they provide  _____.

A. a friendly atmosphere   

B. dormitory beds for sale

C. reviews by previous guests  

D. beds and bathrooms as well

2. The advantage of couch surfing is that  _____.

  

A. you don't have to pay any money

B. you can have a couch to sleep on

C. you can explore the nightlife there

D. the host will charge you for sightseeing

3. The disadvantage of camping is that you have to ______.  

A. sleep in the open air

B. take some extra articles

C. camp near big cities for safety

D. take a long distance bus to the campsites

4. You want a better but not too expensive place to stay, you may choose _____.  

A. Bed and Breakfast    

B. Hostels    

C. Couch Surfing  

D. Camping