办展览会时应统一服务人员的服装,男士要着西装,女士要着套装。()
参考答案:对
思密达对何种毒素有固定作用()
A.大肠杆菌毒素
B.铜绿假单胞菌毒素
C.金黄色葡萄球菌毒素
D.霍乱毒素
E.流感毒素
I hope there will be ____ cars and ____ pollution in the future, thus people will live longer.
A.more, less
B.fewer, less
C.fewer, more
D.fewer, fewer