MobileMarket的三大理念是();();()
参考答案:创新;共赢;互利
-Our classroom__________ every day.
-So it is. It’s our duty to keep it clean and tidy.
A. cleans B. is cleaning C. is cleaned
关于细菌产生的色素,错误的是()
A.有助于鉴别细菌
B.可进行光合作用
C.分两类:脂溶性和水溶性
D.色素产生需一定的条件
E.其功能尚不清楚