单项选择题

The phrase "potential buyer" ( Line 1, Para. 3 ) most probably means______.

A．those who may entertain themselves
B．those who seem to be alive
C．these who may associate the product with fun
D．those who may probably buy the product

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单项选择题

What is a scientific approach used to prove

A．The true value of the product.
B．The buyers' reasoning mind.
C．The true appearance of the product.
D．The high quality of the product.

单项选择题

The statement the horizons of science have expanded ( Line 1, Para. 1 ) means that______.

A．the horizon is enlarged by scientists
B．scientists can observe further space
C．scientist9 are making efforts to expand the outer space
D．science has developed more fields