单项选择题

What does the woman remind the man about

A．That taste buds aren’t located only on the tongue.
B．That taste buds aren't all the same size.
C．That solutions must be measured and mixed careful.
D．That he shouldn’t swallow the solutions.

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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

What will Johnny do to celebrate his 31st birthday

A．Travelling abroad.
B．Going to the park.
C．Eating out with his wife and children tonight.
D．Playing football.