The idea of being able to walk on water has long interested humans greatly. Sadly, biological facts prevent us ever accomplishing such a thing without artificial aid—we simply weigh too much，and all our mass pushes down through our relatively small feet, resulting in a lot of pressure that makes us sink.

However, several types of animals can walk on water. One of the most interesting is the common basilisk Basilicusbasilicus, a lizard (蜥蜴) native to Central and South America. It can run across water for a distance of several metres, avoiding getting wet by rapidly hitting the water's surface with its feet. The lizard will take as many as 20 steps per second to keep moving forward. For humans to do this, we'd need huge feet that we could bring up to our ears in order to create adequate “hitting”．

But fortunately there is an alternative: corn flour. By adding enough of this common thickening agent to water (and it does take a lot), you can create a “nonNewtonian” liquid that doesn't behave like normal water. Now, if the surface of the water is hit hard enough, particles(粒子) in the water group together for a moment to make the surface hard. Move quickly enough and put enough force into each step, and you really can walk across the surface of an adequately thick liquid of corn flour.

Fun though all this may sound, it's still rather messy and better read about in theory than carried out in practice. If you must do it, then keep the water wings handy in case you start to sink—and take a shower afterwards!

1.What do we know about Basilicusbasilicus from the passage?

A. It is light enough to walk on water.

B. Its huge feet enable it to stay above water.

C. It can run across water at a certain speed.

D. Its unique skin keeps it from getting wet in water.

2.What is the function of the corn flour according to the passage?

A. To create a thick liquid.

B. To turn the water into solid.

C. To help the liquid behave normally.

D. To enable the water to move rapidly.

3.What is the author's attitude towards the idea of humans' walking on water?

A. It is risky but beneficial.

B. It is interesting and worth trying.

C. It is crazy and cannot become a reality.

D. It is impractical though theoretically possible.

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A

Pacific Science Center Guide

◆Visit Pacific Science Center’s Store

Don’t forget to stop by Pacific Science Center’s Store while you are here to pick up a wonderful science activity or remember your visit. The store is located(位于) upstairs in Building 3 right next to the Laster Dome.

◆Hungry

Our exhibits will feed your mind but what about your body? Our café offers a complete menu of lunch and snack options, in addition to seasonals. The café is located upstairs in Building 1 and is open daily until one hour Pacific Science Center closes.

◆Rental Information

Lockers are available to store any belongs during your visit. The lockers are located in Building 1 near the Information Desk and in Building 3. Pushchairs and wheelchairs are available to rent at the Information Desk and Denny Way entrance. ID required.

◆Support Pacific Science Center

Since 1962 Pacific Science Center has been inspiring a passion(熱情) for discovery and lifelong @ in science, math and technology. Today Pacific Science Center serves more than 1.3 million people a year and beings inquiry based science education to classrooms and company events all over Washington State. It’s an amazing accomplishment and one we connect science without generous support from individuals, corporations, and other social organizations. Wish pacificorganzier.org to find various ways you can support Pacific Science Center.

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A.To encourage donations.

B.To advertise coming events.

C.To introbace spocial exhibits.

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