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!

　　44. Walking on water hasn't become a reality mainly because humans ________．

　　A. are not interested in it

　　B. have biological limitations

　　C. have not invented proper tools

　　D. are afraid to make an attempt

　　45. What do we know about Basilicus basilicus 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.

　　46. What is the function of the cornflour 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.

　　47. 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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