Theroughnessofashark’sskinhasasurprisinglyusefulquality...

问题详情：

The roughness of a shark’s skin has a surprisingly useful quality --- it can keep away some bacteria. Surfaces that are like sharkskin can even keep away “superbugs”. These disease-causing bacteria cause a global health threat because they resist conventional bacteria-fighting chemicals.

A company has been developing the sharkskin texture (织物). With its tiny ridges (脊) just 3 micrometers tall, the texture feels smooth to the touch. The company, Sharklet Technologies in Aurora, Colo . , wants to place the texture on medical equipment and other surfaces that could host bacteria.

 The inventor of the sharkskin texture is Anthony Brennan. Brennan wasn’t initially trying to fight superbugs. The U. S. Navy wanted to learn how to keep algae(海藻) off the bodies of its ships. Brennan tried to create a surface that, if an organism came to it, it would find it too unstable to attach to.

He tested panels with various coatings, dipping them into the water and hoping they’d come out clean. Just then, Brennan spotted a huge submarine(潜艇) returning to port. Covered with algae, it looked like a big whale. Like large boats, whales and other marine animals have “crusty” skin due to the build-up of algae. But sharks’ skin stays remarkably clear.

The question was why. “I wonder what their skin is made of, ” he thought. Viewed under a microscope, the shark’s skin had a pattern of dips and ridges. He included the shark skin pattern on his test panels and that cut the build-up of green algae by 85 percent. Brennan later discovered, somewhat by accident, that this same texture also prevents the attachment of bacteria, including those that cause human diseases.

New tests have now measured how well the texture keeps away bacteria. Sharkskin-inspired surfaces collect and hold 94 percent fewer bacteria than do smooth surfaces. The surfaces even perform better than copper, a widely used bacteria-fighter.

32. We can learn that Brennan’s Sharkskin texture feels ________.

A. smooth                B. rough              C. hard            D. heavy

33. According to the text, Brennan intended to invent something ________.

A. that is as smooth as whales’ skin

B. that has a stable surface for algae to attach to

C. that has the same texture as whales

D. that prevents organisms attaching to it

34. We can infer that Brennan’s finding is a good example of ________.

A. how clever scientists are in fighting bacteria

B. how researchers can learn useful tips from nature

C. how bacteria live on sharkskin-inspired surfaces D. how bacteria are easy to kill on smooth surfaces

35. If the text continues, it may discuss ________.

A. what sharks’ skin is made of

B. why sharks have smooth skin

C. how the sharkskin texture works

D. whether the sharkskin texture is useful

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知识点：科普环保类阅读

题型：阅读理解