白云岩类中白云岩的质量分数（）。A.小于75% B.大于75% C.小于50% D.

拍卖标的有哪些类型

—Let^，s  do something at the party. What about      ？

—No，I^，d like      .

A．to sing；to dance

B．to sing；dancing

C．singing；dancing

D．singing；to dance

绿色植物在它的一生中，不需要从外界吸收的物质是（　　）

A．氧气

B．二氧化碳

C．无机盐

D．有机物

根据短文内容及所给首字母，填写所缺单词，使短文意思通顺、语法正确。每空一词。

On S  小题1:  morning, Millie and Amy went to Sunshine Park. They love to c   小题2:    there .As u  小题3:   , they sat under the big tree. Suddenly, they h 小题4:   a whisper. They were frightened . They ran away. On their w 小题5:   back , they m 小题6:  Andy. Andy helped them find the ghost. It was a w  小题7:   cat. They took the little cat to the animal c 小题8:   . People there would take c 小题9:   of it. The next Sunday, Millie and Amy went to the park again. They h  小题10: a good time there.

图甲所示为某区域的空间数据模式，每个棚格的面积为250平方米，图中r表示林地，s表示滩地，p表示水体。图乙中的数值表示该区域内各棚格的平均海拔高度。读图完成下列问题。

(1)在图中画出三种地物的界线。

(2)判断水体的类型_________。

(3)正常状态下，三种地物分布的海拔高度分别是：水体________；滩地_______；林地_______。

(4)计算常年水体的面积和最大蓄水面积。