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A shark’s skin is covered with tiny teeth or “denticles”(小齿) which aid swimming. Engineers have tried to mimic the roughness of shark skin when designing swimsuits and even racing cars. But the denticles have never been so well reproduced before, says a report in the Journal of Experimental Biology.
George Lauder and his colleagues took a detailed scan of a tiny square of skin from a mako shark, and built a 3D model of a single denticle, just 0.15mm long. The challenge was then to make a synthetic（合成的）skin. It took them about a year.
3D printing builds up new objects layer by layer, following a computer-generated design. To print the shark skin, the scientists had to use two different materials for the hard, tooth-like structures and for the flexible base ---much like the different colored inks used to print a picture. The particular shape of the denticles also posed difficulties: “Because they’re overhung（悬臂式的）, the 3D printers have to print a supporting material, which you then have to remove” Professor Lauder told the BBC. “It took a while to work out all the tricks.”
The artificial skin has impressed Oliver Crimmen, a fish expert at the Natural History Museum who has previously advised Speedo on swimsuit design. “I used to think: how on earth would you mimic that complex structure accurately?” he said. “3D printing is it ---what a wonderful application for it.”
Because the resolution (分辨率）of even the latest 3D printers is limited, the artificial denticles are about 10 times larger than the real ones seen on the skin of a mako shark. Nevertheless, when the team stuck the new artificial skin onto a small, flexible paddle (桨) and studied it in a water tank, they were able to see the benefit that sharks get from their unusual scales. A paddle with the new, toothy skin delivered a boost of up to 6.6% in swimming speed, compared to one coated with the smooth skin alone. The artificial denticles also allowed the paddle to travel the same simulated distance while using 5.9% less energy. “That’s a huge effect, when factored over the entire lifetime of an animal that is constantly swimming.”said Professor Lauder.
32. What does the underlined word “mimic” in Paragraph 1 most probably mean?
  A. Understand     B. Study     C. Imitate      D. Produce
33.The third paragraph is mainly about the _____ .
  A. advantages of 3D printing technology
  B. materials used for the tooth-like structures and the flexible base
  C. choices of the colors used in printing the denticles
  D. challenges and difficulties researchers faced when doing the research
34. According to the last paragraph, the paddle with the toothy skin ____.
  A. was ten times smaller than the real one
  B. had an increase of over 5.9% in swimming speed
  C. was more flexible than the one with smooth skin
  D. used less energy compared with the smoothly one over the same simulated distance
35. What is the passage mainly about?
  A. 3D printing reveals the benefits of shark skin.
  B. An introduction to the shark’s advantages in the ocean.
  C. The special function of sharks’ teeth in their daily life.
  D. Scientists have built a 3D model of a shark.
第二节（共5小题；每小题2分，满分10分）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。         
      Does this situation seem familiar to you？Your English is progressing well，the grammar is now familiar，the reading comprehension is no problem，you are communicating quite fluently. 36.________
First of all，remember that you are not alone. Listening comprehension is probably the most difficult task for almost all learners of English as a foreign language .So，the most important thing is to listen as often as possible.
    37．________The Internet is really a useful tool for English students. You can download The RealPlayer from RealMedia.com，which allows you to use the Internet like a radio station.
Once you have begun to listen on a regular basis，you might still be frustrated by limited understanding. 38.________　
Here is some of the advice I give my students：
Accept the fact that you are not going to understand everything.
Keep cool when you do not understand—even if you continue not to understand for a long time.
39．________Don’t concentrate on details until you have understood the main idea.
40．________This approach usually results in confusion. Translating leads to a kind of block in one’s brain which sometimes doesn’t allow us to understand anything at all!
By remaining calm，allowing yourself not to understand，and not to translate while listening，your brain is free to concentrate on the most important thing：understanding English in English.
A．Secondly，most people repeat themselves constantly.
B．What should you do?
C．Do not translate everything into your native language.
D．This situation leads to less—not more—understanding.
E．The next step is to find listening resources.
F．Listen for the general idea of the conversation.
G．But listening is STILL a problem. 高考英语模拟试题库  http://www.17xuexiba.com/yy/