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【多选题】
关于弹力，下列说法中正确的是（）A.
物体只要相互接触就有弹力作用
B.
弹力产生在直接接触而又发生弹性形变的两物体之间
C.
压力或支持力的方向总是垂直于支持面并指向被压或被支持的物体
D.
弹力的大小与物体受到的重力成正比
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举一反三
【单选题】What did the researchers discover in northern Kenya?
A.
A human tooth.
B.
A human skull.
C.
Three species of humans.
D.
Three human fossils.
【单选题】What can be inferred from the passage?
A.
Environment pollution has manifested alarming threat for human survival.
B.
The chance for human beings to rescue the planet is very slim.
C.
Compared with aerosols, carbon dioxide is far less threatening to human beings.
D.
The gloomy forecast cannot hold water if the aerosol layer is eliminated.
【单选题】函数rotate(number rotate)用于（ ）？
A.
把当前坐标轴顺时针旋转 rotate 角度
B.
把当前坐标轴逆时针旋转 rotate 角度
C.
把当前坐标轴顺时针旋转 rotate 弧度
D.
把当前坐标轴逆时针旋转 rotate 弧度
【单选题】What does Dr. Richards mean when he says 'It will be can equal partner with the other three treatment in the next five to ten years'.*
A.
Within a decade, immune therapy will replace the other treatments.
B.
In the near future, immune therapy will prove to be a better treatment.
C.
For sometime, immune therapy will not be the only treatment for the desired effect.
D.
Within the next five to ten years, immune therapy will only be main treatment for cancer.
【单选题】函数 rotate(number rotate) 用于( )?
A.
把当前坐标轴逆时针旋转rotate角度
B.
把当前坐标轴顺时针旋转rotate角度
C.
把当前坐标轴顺时针旋转rotate弧度
D.
把当前坐标轴逆时针旋转rotate弧度
【单选题】What CANNOT be inferred from the first paragraph?
A.
Scientific experiments in the past three hundred years have produced many valuable items.
B.
For three hundred years there have been people holding a hostile attitude toward science.
C.
Modern civilization depends on science so man supports scientific progress unanimously.
D.
Some people think three hundred years is not long enough to set hack for critical appraisal of scientific method.
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