更多"Why researchers put trees in extra "的相关试题:
[单项选择]Why researchers put trees in extra carbon dioxide in the first study
A. To learn whether trees can still absorb carbon dioxide under extreme conditions.
B. To get more oxygen from these trees.
C. To evaluate the maximum carbon dioxide that trees can absorb.
D. To see the growth rate of these trees.
[单项选择]Why did people cut down trees
A. For advantage.
B. For benefit.
C. For house.
D. For business.
[单项选择]Why did Shaefer put the paper under glass
A. To prevent Rosa from feeling the print.
B. To stop the reflection of heat.
C. To make things as difficult as possible.
D. To stop her from cheating.
[单项选择]Why was it possible for these ancient trees let more light through than modern ones
A. Because they were closely spaced, only 3 to 16 feet apart.
B. Because they were smaller plants and shrubs.
C. Because their branches did not fan out as far as to form a shape like umbrella.
D. Because they had very small leaves like that of fern and dropped easily.
[单项选择]Why do some people think hemp is better than trees for paper industry
A. It is cheaper to grow hemp than to cut down trees.
B. More paper can be produced from the same area of land.
C. Hemp planting can beautify the environment.
D. Hemp can produce paper of high quality.
[单项选择]Why is the mixed planting of trees of the same species advocated in modern orchards and forests
A. Because mixed forests and orchards are the recognized procedures these days.
B. Because trees of same species may spread disease.
C. Because orchards and forests are modern.
D. Because trees planted crowdedly do not have enough room to develop their roots.
[单项选择]Why is the close planting of trees of the same species avoided in modern orchards and forests
A. Because mixed forests and orchards are the recognized procedures these days.
B. Because trees of same species may cause the spread of disease.
C. Because modern orchards and forests are more specialized.
D. Because trees planted crowdedly do not have enough room to develop their roots.
[单项选择]Why did the scientist put the paper under glass
A. To prevent Rosa from feeling the print.
B. To stop the reflection of heat.
C. To make things as difficult as possible.
D. To stop her from cheating.
[单项选择]Why did the farmer put the pills in the tube
[单项选择]Why does the writer put the suggestion that, advisory councils should be set up______
A. Because they can influence business operations
B. because business improvements depend on communication with them
C. Because they are heavily relied on by prosperous companies
D. Because goals and objectives are set out by them
[单项选择]Why does the author put "neutron star" in quotation marks
A. It is a special term of astronomy.
B. It is an invented term.
C. He is quoting an authority.
D. He is using the term ironically.
[单项选择]Why does the author think it unnecessary to put the cell phone on a restaurant table
[单项选择]Why don't you put the meat in the fridge It will______ fresh for several days.
A. be stayed
B. stay
C. be staying
D. have stayed
[单项选择]Why did the owner of the shop put the book in a comer
A. He put it there in case anyone was persuaded to buy it.
B. He put it there in case anyone was inclined to buy it.
C. He put it there in case anyone was attracted to buy it.
D. He put it there in case anyone was fascinated to buy it.
