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【单选题】
化学反应 CO(g) + Cl 2 (g) → COCl 2 (g) ,实验测得速率方程为 v = k (Cl 2 ) n (CO) ,当维持温度和 CO 的浓度不变时, Cl 2 浓度增大到 3 倍,反应速率是原来的 5.2 倍,则反应对 Cl 2 的级数是 ( ) 。A.
1
B.
2
C.
3
D.
1.5
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【单选题】What had been the principal use of the antlers?
A.
To help in removing trees and bushes to cultivate the land.
B.
To obtain the material for useful tools.
C.
To prepare the fields for fanning.
D.
To make many artifacts useful in dally life.
【单选题】Most of the deserts ______ to be covered with bushes and trees. [ ]
A.
used
B.
were used
C.
use
D.
got used
【单选题】The cat padded across the road and towards the bushes just _______ the hornbeam trees, and she stopped.
A.
except for
B.
apart from
C.
beyond
D.
from
【单选题】The island had______.
A.
a lot of vegetation but no trees, bushes or flowers
B.
rio vegetation(植物) or wildlife
C.
plentiful supplies
D.
a few birds and animals
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