单项选择题

A．It’s my birthday present．
B．Four times a year．
C．I think it’S worth reading．
D．Two dollars．
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单项选择题
A．8:30．B．9:00．C．9:30．D 10:00．
A．8:30．
B．9:00．
C．9:30．D 10:00．
填空题
When you were six years old,you had 20 teeth.These are called milk-teeth.After you are six,your milk-teeth begin to (11) .They’re making way for a new (12) .As new teeth comein,they cut off the (13) supply to the milk-teeth.After a while,the milk-teeth fall out.By the time you are 25,you should have a whole new set of teeth.And you’ll have 12 (14) teeth.In all,you’ll have (15) teeth in each jaw.
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