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 dioxide.
[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]On the hill are maple trees（）leaves have turned red.
A. who
B. whom
C. whose
D. which
[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 is the most important service of trees to man according to the passage
A. They help him make money.
B. They give him wood and other products.
C. They help him prevent droughts and floods.
D. They give him shade.
[单项选择]In this park, sparrows often fly down from trees to eat from visitors' hands. They are used to ______in this way.
A. be fed
B. feed
C. having fed
D. being fed
[单项选择]Trees take harmful gas from the air, and ______ oxygen (氧气)into the air.
[单项选择]Softwood comes from cone-bearing trees, which is ______ conifers(针叶树).
A. planted
B. called
C. watered
D. laid
