细菌生长繁殖的条件
A. 适宜的温度
B. 充足的营养物质
C. 必要的气体
D. 合适的酸碱度
E. 活细胞内
细菌的营养物质主要有
A. 水
B. 碳
C. 氮
D. 无机盐
E. 生长因子
Tea is a ________ of the remotest time in China.
A. staple food
B. beverage
C. dish
D. soup
How long is the history of Chinese tea ?
A. 2, 000 years.
B. 3, 000 years.
C. 4, 000 years.
D. 5, 000 years.