单项选择题

What is the main purpose of the lab experiment

A．To see how certain chemicals produce different flavors.
B．To determine if a person can distinguish salty and sweet solutions.
C．To map the location of taste buds.
D．To count the number of taste buds.

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单项选择题

About how long does it take to do the experiment

A．Just five minutes.
B．Slightly less than an hour.
C．Between one and two hours.
D．A little more than two hours.

单项选择题

How many times has Johnny’s team won the League Cup

A．Once.
B．Twice.
C．Three times.
D．Four times.