易透过血脑屏障的药物具有特点为（）
A.与血浆蛋白结合率高
B.相对分子质量大
C.极性大
D.脂溶度高
E.脂溶性低
参考答案：D
What a pity! I missed meeting my friend at the airport because my car was ________ in the traffic jam. [ ]
A. broken up
B. held up
C. kept back
D. kept up
疼痛在腰脊中部，主要的相关经脉是（）
A.足太阳膀胱经
B.足少阴肾经
C.足少阳胆经
D.带脉
E.督脉
