E
Every year farmers in areas which often suffer flood in Southeast Asia lose millions of tons of rice to high water that kills their crops. That large amount of waste may soon be a thing of the past: SUBIA, a gene discovered by researchers which the International Rice Research Insitule (IRRI) and the University of California, allows rice palnts carrying the gene to live completely under water for two weeks.
Flood – resistant(抗水浸) rice turned up among the 110,000 types of seed stored at the institute. It produced disappointingly low yields(产量) , but scientistis were able to transfer the gene into more bountiful varieties. These have shown promising results in tests by growers in India and Bangladesh over the past two years.
This rice success story would not have been possible without the treasure of genetic diversity hidden in the IRRI’s vault (underground room). As the world faces new agricultural challenge – charging climate, bugs and diseases that have developed resistance(抵抗力) to old defenses – such genetic resources are likely to become increasingly valuable. Fortunately, the IRRI is one of more than 1,000 organizations around the world working to protect crop genes. Most plant species grown for food have an associated bank that stores thousands of samples; seeds of landraces, wild relatives, and varieties that are rare, old, or adapted to very specific envionments. The banks ensure that it will be possible to develop new varieties in the future.
The need for these botanical libraries has its roots in modern agricultural practices. According to the U. N. Food and Agriculture Organization, 75 percent of plant diversity has been lost over the last century. Of more than 30,000 eatable species, humans grow just 200 for food; 60 percent of plant calories in our diet comes from wheat, rice, and corn.
72．Accordint to the second paragraph, what can we learn about the flood – resistant rice?
A．It produces a small amount of rice.
B．Scientists have developed many more varieties of it.
C．Sientists have managed to improve its output.
D．It can produce more rice than the other 110,000 types at the institute.
73．From the passage we can infer that        .
A．the newly – discovered gene will bring hope to the farmers in the areas often suffering flood
B．scientists will not be able to change the fact that rice plants carrying the gene produce low yields
C．the tests by growers in India and Bangladesh were hopeless
D．110,000 types of seed stored at the Institute are flood -  resistant
74．What’s the main idea of the third paragraph?
A．The world faces new agricultural challenges.
B．Such genetic resources are likely to become valuable.
C．Scientists set up banks to store thousands of seed samples.
D．We should owe the rice success story to the seed banks.
75．As to the botanical libraries, the writer thinks they are            .
A．useless      B．unnecessary      C．needful     D．needless

What parents say and do in daily life usually have a(n) _________ influence on their child.

1. A.
   practical
2. B.
   avoidable
3. C.
   beneficial
4. D.
   permanent

第二节完形填空(共20小题；每小题l 5分，满分30分)
阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Recently，I flew to Las Vegas to attend a meeting. As we were about to arrive，the pilot announced with apology that there would be a slight 2l     before setting down. High desert winds had   22   the airport to close all but one runway. He said that we would be   23   L the city for a few minutes waiting t0  24    We were also told to remain in our seats meanwhile with our seat belts fastened  25   there might be a few bumps(颠簸)．We11，that few minutes turned into about  four—five minutes，including a ride that would make a roller coaster(过山车)  26  by comparison
The movement was so fierce that several passengers felt  27   and had to use airsickness bags. As you might guess，that’s not good thing to have happen in a(n) 28    space because it only 29    to increase the discomfort of the situation.
About twenty minutes into the adventure，the entire airplane became very 30 .
There was now a sense of anxiety and fear that could be 31   noticed．Every passenger simply held on for dear life …except one. A  32  was having a good time! With each bump of the33!he would let out a giggle(咯咯的笑)of delight As I observed this，I 34     that he didn’t know he was supposed to be afraid and worried about his    35 He neither thought about the past nor about the future Those are what we grown—ups have learned from  36   .He was 37  the ride  because had not yet been taught to fear it. Having  understood this，I took a deep breath and   38  back into my seat，pretending I was   39   on a roller coaster. I smiled for the rest of the flight. I even  40    to  giggle once or twice ,much to the chagrin(随恼)of the man sitting next to me holding the airsickness bag.
21. A. mistake      B. delay       C. change         D. wind
22. A. forced       B. warned     C. swept           D. reminded
23. A. watching     B. visiting     C. circling          D. crossing
24. A. arrive       B. enter        C. stop           D. land
25. A. if           B. though      C. because         D. while
26. A. light        B. pale         C. easy           D. quick
27. A. sick         B. nervous     C. angry          D. afraid
28. A. empty       B. narrow      C. secret          D. open
29. A. happens      B. continues    C. fails           D. serves
30. A. quiet        B. hot          C.  dirty         D.  crowded
31. A. partly        B.  gradually   C. shortly         D. clearly
32. A. pilot         B. baby        C.  guard         D.  man
33. A. seats        B.  passengers    C. flight          D. airplane
34. A. realized      B.  hoped      C.  agreed        D.  insisted
35. A. health       B. safety        C.joy             D. future
36. A. teachers      B. books       C.  experience     D.  practice
37. A. learning     B.  taking      C.  missing       D.  enjoying
38. A. sat         B. lay          C. went            D. rode
39. A. nearly      B.  finally      C.  really          D.  suddenly
40. A. attempted    B.  managed     C.  wanted       D.  decided

On the Iraq­Syria border，a pack of wild dogs circled American soldiers for food．The leader of the pack was a gray­and­white dog．The soldiers called him Nubs．Nubs was shaking and __36__ able to stand．Marine major Brian Dennis looked closer and saw that there was a knife wound __37__ his chest．
Dennis couldn’t stand seeing the dog __38__．He and his men immediately treated the wound，and gave Nubs medicine．Nubs__39__but was still in pain．The next day，the team had to__40__．Ten days later，Dennis’s unit was back，and so was Nubs．He was still___41__，but the men fed him and played with him．
Before long the unit once again__42__an outpost (前哨) 70 miles away．Nubs，slowly but determinedly，__43__them far into the trackless wasteland until the men lost__44__of him．Two days later，beyond Dennis’s__45__，he saw Nubs just outside the outpost．The dog had tracked him across 70 miles of frozen desert to__46__with the friend who had saved his life．From then on Nubs and the men slept in the same place，and ran around in the same ruins．
Until an order came down from above that they were not__47__to have pets. Dennis__48__to make sure the dog would continue to live the__49__life．So he quickly raised $4,000 from his family and friends to fly Nubs to__50__．
A month later，when Dennis and the dog were__51__in California，at first Nubs didn’t recognize the guy．__52__within minutes，the dog jumped into Dennis’s arms，jumping up again and again to__53__ his friend’s face．
A little__54__and concern in the middle of war will not save a violent world．But small stories，like the story of a soldier and a dog，hold a promise of a(n) __55__world．