红霉素与林可霉素合用可以
A．扩大抗菌谱
B．增强抗菌活性
C．减少不良反应
D．增加生物利用度
E．互相竞争结合部位，产生拮抗作用
参考答案：E
某一企业提高劳动生产率，可以降低商品价值量。[ ]
There were too many people in the park, _______ they still enjoyed staying there.[ ]
A. because
B. or
C. but
D. so
