更多"It has calculated that the earth's "的相关试题:
[单项选择]The history of life on earth has been a history of between living things and their surroundings.
A. interaction
B. intersection
C. interference
D. intercourse
[单项选择]It has been estimated that the earth's surface temperature has increased ______ one quarter to three fourths of a degree since 1850.
A. by
B. at
C. to
D. with
[单项选择]
The Earth has a force that pulls thing toward itself. We call this force gravity. This is something we live with all the time, and we take it for granted and hardly ever think about it . But it is a most important factor in rocket operation and must overcome if we are to get anywhere in space, or off the ground at all.
Take the throwing of a ball as an example. The harder the ball is thrown, the faster and higher it will go. What is the secret Its speed. If we could throw the ball hard enough it would go up and up forever and never come down. The speed at which it would have to be thrown do this is known as escape speed. Of course, we cannot throw a ball hard enough because the speed required to escape completely from the Earth's gravity is seven miles per second, or over twenty-five thousand miles per hour.
Once escape speed has been reached by a space
A. runs along the hillside
B. does not need any further power
C. runs freely to all directions
D. does not meet with air resistance
[单项选择]What has happened to the earth's temperature over the last 18 years according to satellite data
A. It has increased slightly.
B. It has not changed.
C. It has decreased slightly.
D. It is not sure if it has changed.
[单项选择]It can be seen from the passage that the earth's supply of natural medicines
A. may never be exhausted.
B. may be dropping rapidly.
C. is surprisingly big.
D. is as rich as ever.
[单项选择]An analyst has calculated the following ratios for a firm: Sales/Total Assets: 2.8 Net Profit Margin (%): 4 Return on Total Assets (%): 11.2 Total Asset/Equity: 1.6 The return on equity for this firm would be closest to:（）
A. 4.48%.
B. 6.40%.
C. 17.92%.
[单项选择]Approximately (three - fourths) of (the earth's) surface (are) covered (with) water.
A. three-fourths
B. the earth’s
C. are
D. with
[单项选择]First designated in 1970, Earth Day has become an annual international event ______ concerns about environmental issues such as pollution.
A. dedicated to raising
B. dedicated raising
C. dedicated to raise
D. that dedicates to raising
