单项选择题

Questions 21-23 are based on the instruction you’ve just heard. How often should the beans be watered a day

A．Once.
B．Twice.
C．Three times.
D．Four times.
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单项选择题
How many flights a day are there from London to San Francisco
A．one
B．Two
C．Three
D．Four
单项选择题
What happens when the beans are kept in water for twelve hours
A．They shrink.
B．They swell.
C．They don’t change.
D．They sprout.
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