试题与答案

一位同学吃了如下一份早餐:一块面包、一杯鲜牛奶、少量的蔬菜和水果,回答: (1)

题型:填空题

题目:

一位同学吃了如下一份早餐:一块面包、一杯鲜牛奶、少量的蔬菜和水果,回答:

(1)面包的主要营养成分是淀粉,其最早开始消化的场所是____        

(2)牛奶的主要营养成分是蛋白质,其最终的消化产物是____       

(3)营养成分消化和吸收的主要场所是            

答案:

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题型:阅读理解

阅读理解。

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1. In this passage, the underlined word "ruins" most probably means ______. [ ]

A. 废墟

B. 遗迹

C. 雨水

2. The mum's death and her great ______ for her baby made everyone burst into tears. [ ]

A. hope

B. care

C. love

3. From the passage, we know the mum saved her baby ______.[ ]

A. with her body

B. in a small quilt

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题型:问答题

一同学住在21层高楼的顶楼.他想研究一下电梯上升的运动过程.某天他乘电梯上楼时携带了一个质量为4kg的重物和一个量程足够大的台秤,他将重物放在台秤上,电梯从第l层开始启动,一直运动到第21层才停下.在这个过程中,他记录了台秤在不同时段内的读数如下表所示.

时间/s台秤示数/N
电梯启动前40.0
0~3.048.0
3.0~12.040.0
12.0~18.036.0
18.0末40.0
根据表格中的数据(g=l0m/s2),求:

(1)电梯在最初加速阶段的加速度大小a1

(2)最后减速阶段的加速度大小a2

(3)电梯在中间阶段上升的速度大小v;

(4)该楼房平均每层楼的高度h.

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