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 Basiilius 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 watch
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 rove rapidly.
47. What is the author's attitude toward 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 thigh theoretically possible.