脊髓灰质炎所导致瘫痪部位多见于()
A．双上肢软瘫
B．双下肢软瘫
C．双手受累重
D．单足受累重
E．单侧下肢软瘫
参考答案：E
不等式|x＋2|－|x|≤1的解集是________．
Many of the students turned a deaf ear to his advice, _______ they knew it to be valuable. [ ]
A. as if
B. now that
C. even though
D. so that
