单项选择题

下列关于上颌尖牙与下颌尖牙的区别，描述错误的是（）

A．下颌尖牙舌窝深
B．上颌尖牙牙根粗壮，下颌尖牙牙根细长
C．上颌尖牙岫嵴明显
D．上颌尖牙近远中斜缘相交近90°，下颌尖牙成钝角
E．上颌尖牙体积较大，牙冠宽大，下颌尖牙体积较小，牙冠窄长

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A．They chased the bear away.B．They stayed outside the tent and did nothing.C．They climbed up a tree.D．They put some honey outside for the bear to eat.
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听力原文：W: It' s Surprising that Tom came out of the accident alive.M: That's true. The car crashed into the wall and was completely damaged.Q: What was the consequence of the accident?(19)A．Tom survived the accident.B．Tom was killed in the accident.C．Someone saved Tom' s life.D．It did little damage to Tom' s car.
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