腰椎管狭窄患者最突出的症状是（）
A.下腰痛和腿痛
B.腰部过伸活动受限
C.间歇性跛行
D.鞍区麻木、胀痛和针刺样疼痛
E.第4~5腰椎压痛
参考答案：C
单词拼写
1. The library is only open at c_____ times of day.
2. To a_____ one's purpose depends largely upon one's effort.
3. Students in this 1_____ may have problems with basic grammar.
4. He is always coming up with b_____ ideas for making money.
5. We have to finish, h_____ long it takes.
国家发展改革委每年（）底前汇总上年度各地脱硫电价执行和扣减情况并向社会公布。
A.二月
B.三月
C.一月
D.十二月
