单项选择题

What change does the woman suggest the co - up make

A．Lowering its prices.
B．Selling more household necessities.
C．Changing its membership rules.
D．Opening up more checkout lines.
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单项选择题
Which of the following is the characteristic of hydrogen
A．It is nontoxic.
B．It has lots of vapour.
C．It doesn’t produce damaging fuels.
D．It costs less.
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