【题目】热带雨林是地球上功能最强大的生态系统，也是生产力最高的生物群落，但同时也是一个非常脆弱的生态系统。据此回答下列各题。
【1】热带雨林生态功能强大的表现是
①维护地球上的碳氧平衡
②是世界医药之源
③提供大量的优质硬木
④维持全球的水循环和水平衡
A．①② B．②③ C．③④ D．①④
【2】热带雨林的脆弱性表现在
A．生物残体分解快
B．植物生长速度快
C．养分几乎全部储存在地上的植物体内
D．群落以高大的乔木为主
【3】为促进世界森林的可持续经营、保护和开发，我们应该
A. 封山育林，禁止对森林的砍伐
B. 注重开发，提高林业经济效益
C. 禁止各种木材的流通和买卖
D. 采育结合，综合开发利用
【答案】
【1】D
【2】C
【3】D
【解析】
试题分析：
【1】提供大量的优质硬木，属于经济效益；维持全球的水循环和水平衡，不是森林的生态功能，所以D正确。
【2】雨林生态系统的生物循环旺盛，植物在快速生长的同时形成枯枝落叶，这些生物残体在地表很快就被分解者分解，所释放的养分又直接被根系再吸收以继续维持植物的快速生长，由于有机质分解和养分再循环旺盛，土壤自身很少积累和补充养分，再加上长期高温多雨的淋洗，雨林中的土壤一般很贫瘠。
【3】森林生态系统分布在较湿润的地区，动植物种类繁多，森林在涵养水源、保持水土、防风固沙、调节气候、净化空气、消除污染等方面起着重要作用，有“绿色水库”、“地球之肺”之称，为促进世界林木的可持续经营、保护和开发，我们应该采育结合，综合开发利用。
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【题目】七选五
阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。
House Sitting
In many countries of the world people do what is called house sitting. It means that if owners of the house are going away, they want someone to come into their home and look after the house and maybe pets while they are away.
In Australia, many people travel. After people retire, they might buy a van and travel all over the country. 1
So if someone wants to travel or go away for some reason, they might want someone in their home to care for it and keep the gardens tidy. House sitters might have to care for pets. Also, quite a few people have swimming pools in their back yard and they need cleaning. 2 I feel it is a great way of seeing the country, because you go and stay in a new city, get to meet new people, and have time to go sightseeing in a new area.
3 There are websites where you find the advertisements by people who want to travel, and by replying to the advertisement, you can make arrangements to go and look after their home.
There are some requirements to be a house sitter. You must be a trusted person, so that the home owner knows you will not steal anything. You must be able to go when the house owner wants you to go, so you need lots of free time. 4 You need to be good with pets, able to care for cats and dogs, or other pets they may have.
Sme house sitting jobs are just for a few days or a couple of weeks while the house owners have a short holiday. Sometimes it is for much longer. We have had one house sit for six months, while the home owner travelled to Europe.
5 Then you can travel to many different countries and stay there. One of the important things to get is references from the home owners where you have stayed. A reference is a written letter to say that you are trustworthy and have looked after their home well. You can show these letters to possible house sitting jobs and they know you will do a good job.
A. I have done house sitting many times.
B. Thousands of people do this all the time.
C. It is also possible to do house sitting in other countries.
D. Generally you have many opportunities to get a house sitting job.
E. You must take a little care over what your description says about you.
F. This is an international house sitting service for all city and country areas.
G. You must have a good car, so you can travel to different parts of the country.
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【题目】完形填空
Love in a Box
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Mother said, ＂We’ll see.＂ And she continued eating.
What did ＂We’ll see＂ mean? I had to have that box 2 my second grade Valentine’s Day would be a disaster. Maybe they didn’t love me enough to help me with my 3 .
All Saturday I waited 4 and with Sunday arriving, my concern increased, but I 5 an enquiry (询问) about the box might 6 anger or loud voice, for in my home children only asked once. More than that 7 trouble.
Late Sunday afternoon, my father called me into the kitchen. The table was covered with colorful 8 of different kinds. A(n) 9 shoebox rested on top of it. 10 flooded through me when Daddy said, ＂Let’s get started 11 your project.＂
In the next hour my father 12 the shoebox into an impressive valentine box. Colorful paper covered the ugly cardboard with red hearts 13 to what I considered all the right places. He sang while he worked. When he finished, he was so delighted that a 14 smile spread over his face. ＂What do you think of that?＂ he asked.
I answered him with a hug(拥抱).
But inside, 15 danced all the way to my heart. It was the first time that my father had devoted so much 16 to me, for his world consisted of work only.
The holiday party arrived, and my classmates put cards and presents into the valentine boxes. Laughter filled our classroom until dismissal time 17 .
On the way home, I held out my valentine box for the world to 18 . The love that filled it meant more to me than all the valentines inside.
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【2】A.and B. but C. or D.so
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【13】A.joined B. tied C. contained D. connected
【14】A.slight B. brief C. broad D. funny
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【17】A.reached B. set C.
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