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【单选题】
用水准测量法测定A、B两点的高差，从A到B共设了两个测站，第一测站后尺中丝读数为1234，前尺中丝读数1470，第二测站后尺中丝读数1430，前尺中丝读数0728，则高差hAB为( )米。A.
-0.938
B.
-0.466
C.
0.466
D.
0.938
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举一反三
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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.
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used
B.
were used
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use
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got used
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A.
except for
B.
apart from
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beyond
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from
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a lot of vegetation but no trees, bushes or flowers
B.
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plentiful supplies
D.
a few birds and animals
【单选题】Insects live in bushes and grass and trees, in fields and houses and in the ground. Some even live on other animals. Did you know that there are more insects in the world than any other kind of animal...
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in bushes
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in the ground
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on some animals
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