问题 实验题

某同学用天平和量筒测量液体的密度,回答下列问题。

(1)他在使用天平时,先把天平放到水平桌面上,把游码放到标尺左端的零刻线后发现指针如图1所示,要使天平平衡应该调节左侧的平衡螺母向_________调节。

(2)这个实验的原理是_________________。

(3)实验记录表格如下,表格中已经记录了最初烧杯和液体的总质量,图2中所示的是他将烧杯中的一部分液体倒入量筒后,烧杯和剩余液体的总质量,图3显示的是从烧杯中倒入量筒内的液体的体积。请根据图中显示的情况,帮助小明完成实验数据表格的填写

答案

(1)右

(2)ρ=m/v

(3)

阅读理解

There are many wetlands in China and some of them have become the world's important wetlands. The Chinese Yellow Sea Wetlands are among them. They are in Yancheng, Jiangsu Province. The east of China. They are home for many different kinds of birds and animals. The world's largest Milu Deer Nature Reserve in them. More than 700 milu deer live freely there. There are not many red-crowned cranes in the world, but every winter you can see some in the Red-Crowned Cranes Nature Reserve in the Yellow Sea Wetlands.

The temperature in the wetlands is usually neither too high nor too low. There is a lot of rain an sunshine, too. They are really good places for wildlife. Offering food. But some people want to change the wetlands to make more wildlife. Offering food and homes for some special kinds of animals and birds is not the only reason why we need to protect wetlands. Wetlands are important because they also prevent flood. But some people want to change the wetlands to make more space for farms and buildings. This means there will be less and less space for wildlife.

Luckily, more and more people are beginning to realize the importance of wetlands and wildlife. Every year, on February 2nd,many activities are held to tell people more about wetlands.

小题1:The Chinese Yellow Sea Wetlands are in the      of China.

A.east

B.south

C.west

D.north小题2:Usually the weather in the wetlands is     .

A.hot

B.pleasant

C.cold

D.dry小题3:The World Wetlands Day is on     .

A.April 22

B.June 25

C.February 2

D.March 22小题4:Which is the best title for the passage?

A.China’s wetlands have all entered the world’s list

B.Wetlands—home for wildlife and humans

C.Special animals in the Chinese Yellow Sea Wetlands

D.Wetlands—valuable resources(珍贵资源)of land on the earth

单项选择题