下图为城市某功能区一天内不同时段的人口流动状况示意图，由图可知该功能区是
A、商业区
B、住宅区
C、工业区
D、行政区
答案：B
Read and number. 读一读，排序标号。
( ) Then I go to school.
( ) At 12:00, I eat lunch.
( ) Then I go home.
( ) In the morning, I eat breakfast.
( ) I learn Chinese, English and math at school.
( ) At four thirty, I play badminton with my friend.
( ) In the evening, I eat supper with my family.
配制一定量某植物营养液．已知该营养液中需要钾元素78g，氮元素70g，则需要KNO3和NH4NO3的质量分别为（ ）
A．101g和400g
B．202g和200g
C．202g和400g
D．202g和120g
