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22.千年之后地球上的居民可能可以用生态系统来处理垃圾。（ecological system）
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23. 这条蛇是如此的贪婪，一口就吞掉了那只老鼠。（swallow up）
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24.虽然缺钱他还是设法让自己的妹妹去上学。（lack）
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25.这本书对学生来说太难理解了。
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话题精练 四、七选五
【2018年惠州市第二次调研】By 2025,water shortage will be a big problem for about 1.8 billion people. In a world where water resource is increasingly short, nations cannot afford to waste it. 26 After we use water in our homes and businesses, it is washed away, and takes many valuable resources with it.
Waste water is rich in carbon and nutrients. 27 A number of nations and major cities have already built waste water treatment plants. They can
effectively recover nutrients and bioenergy, and produce “new water” that can be reused.But more than 80% of all waste water still currently flows into natural ecosystems, polluting the environment and taking valuable nutrients and other recoverable materials with it.
28 This is still better than the situation in smaller cities. In Latin American countries, those living in small and mediumsized cities at most treat it in the form of septic tanks（化粪池）that lack regular and proper maintenance.
Imagine that outside one of these small cities lies a lovely piece of land: on the surface it is pleasingly built and provides habitats for local
wildlife.Beneath the surface is a wetland that treats waste water and produces energy.The energy produced saves families from having to use firewood collected in the wild. This is not a dream project 29 A team of scientists have been looking into the potential of constructed wetland environments Having analyzed 800 examples of biomass in more than 20 countries, they found that, depending on climate and the type of plant used in the construction of this type of wetland, up to 45 hectares of land could be irrigated with waste water ___30
A.But that is exactly what we do.
B.This can provide easy access to clean water.
C.There is no longer any good reason to waste any type of water.
D.A constructed wetland environment is already in practice on a small scale.
E.This would reduce the need for fresh water for irrigation and energy for pumping.
F.If collected and treated properly, it could provide “new water”, fertilizer, and energy.
G.Although waste water system in large cities are effective, the whole procedure usually costs much.
五、完形填空
【2018年成都外国语学校高三开学考试】We were depressed and things were tough. Mom had a 31 time raising us on her own because Dad died five years ago. We relied on social assistance for 32 .
Looking back, I 33 remember what Mom went through to send us to school. I studied hard then. Every morning, she would put a new piece of cardboard in our shoes because our shoes were 34 . Constant moving was typical for my family in these times. Rent was 25 dollars a month but Mom couldn’t 35 it. Though it was hard, we never 36 .
Christmas was approaching. We were given 25 dollars for social services. Instead of buying food, Mom would use the money to pay the 37 ,
ensuring us all of a 38 over our head. ___39 we had nothing for Christmas.
Unknown to Mom, I had been selling Christmas trees to earn enough money for a new pair of _ 40 . On the afternoon of Christmas Eve, I was 41 to go to catch the bus.
As I reached the stop, I began to feel 42 . I was going to buy a new pair of boots 43__ Mom was at home in tears. My mind was 44 and I realized what I had to do. I didn’t get on the 45 .
I went in a grocery store and bought the Christmas treats. I 46 home and put them quietly against the door. I knocked on the door. When Mom opened the door, 47 rolled into the house. She just stood there 48 . I managed to hold back the 49 , saying, \really is a Santa Claus!\
That day I got many 50 and kisses from Mom. It was a Merry Christmas for us after all!
31. A. good B. short C. hard D. funny
32. A. life movement
B. travel C. nursery D.
33. A. hardly B. still C. yet D. then
34. A. handed over worn out
B. picked up C. turned over D.
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