单项选择题

动物在由低级向高级发展过程中的特点是（）
A、牙根数目减少
B、牙根长度增加
C、牙的数目由多变少
D、牙尖高度降低
E、磨牙逐渐前移

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单项选择题

Questions 12 to 15 are based on the conversation you have just heard.
12.
A、Have her house repainted.
B、Replace some of her old furniture.
C、Move into a newly-painted house.
D、Calculate the cost of the paint job.

单项选择题

在Motionbuilder中，约束的类型不包括

A．Simple Constraint
B．Expression Constraint
C．Relation Constraint
D． Complex Constraint