神经传导的特征为（）
A.完整性
B.绝缘性
C.双向性
D.相对不疲劳性
E.无序性
参考答案：A, B, C, D
(2013·东北三校4月联考)—Car prices have been going down sharply in the last 20 years.
—It's not surprising because the law of market ________ the price of a product.
A．is controlling
B．controls
C．has controlled
D．controlled
既能滋阴解毒，又能清热凉血的药物是( )。
A．赤芍B．生地黄C．玄参D．穿心莲E．大血藤
