It's less expensive to buy goods in ___, but you'd better examine the ___ before buying them. [ ]

A. quantity ; quality

B. quantity ; quantity

C. quality ; quality

D. quality ; quantity

以下均为脑瘫的主要特征，除外（）

A.四肢和躯干的对称性瘫痪

B.抗重力运动困难；分离运动困难

C.原始反射残存

D.发育不均衡；肌张力不平衡

E.存在异常的感觉运动；联合反应和代偿运动持续存在