更多"What happened to the leaves falling"的相关试题:
[单项选择]What happened to the leaves falling from the trees in the second study
A. They broke down and the main parts turned into oxygen.
B. They broke down and the carbon content had mainly turned into carbon dioxide.
C. They broke down and the carbon content was mainly absorbed in the soil.
D. They absorbed more carbon dioxid
[单项选择]______ , leaves from certain trees such as the maple turn into bright colours.
A. During the fall
B. With the fall
C. While the fall
D. Along the fall
[单项选择]What happens to trees each year
A. Their tings get thinner and thinner.
B. They add a ring of wood.
C. Their rings get darker in color.
D. They become more valuable.
[单项选择]On the hill are maple trees（）leaves have turned red.
A. who
B. whom
C. whose
D. which
[单项选择]What is the most important function of trees
A. Providing fuel.
B. Offering shade.
C. Preventing natural disasters.
D. Providing charcoal.
[单项选择]What will the man do before he leaves
