调查成果的检查验收是保证调查数据（）的主要手段之一。
A.准确、及时
B.真实、可靠
C.科学、合理
D.权威、严谨
参考答案：B
Sarah had her washing machine repaired the day before yesterday, ____ she? [ ]
A. had
B. did
C. hadn't
D. didn't
大脑皮质运动区的瘫痪多表现为（）
A.交叉性瘫痪
B.完全性上下肢均等偏瘫
C.单瘫或上下肢不均等偏瘫
D.四肢瘫
E.截瘫
