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【单选题】
______ means the conducting of business communication and transaction over network and through computers．A.
E-mail
B.
E-Government
C.
E-text
D.
E-Commerce
手机使用
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新浪微博
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反馈参考答案：
举一反三
【单选题】What does the passage mainly discuss?
A.
Characteristics of soil quality.
B.
Particles typically found in soil.
C.
The importance of soil texture.
D.
How to determine soil texture.
【单选题】What can contribute to drought?
A.
over-farming and soil erosion
B.
soil moisture
C.
water conservation
D.
natural disasters
【单选题】高速 路上巡警开车在公路上以 8 0km/h 的恒定速度巡查,在同一车道上巡警车向前方的一辆轿车发出一个已知频率的电磁波,如果该电磁波被那辆轿车反射回来时,巡警车接收到的电磁波频率比发出时低,说明那辆轿车的车速 ( )
A.
高于 8 0km/h
B.
低于 8 0km/h
C.
等于 8 0km/h
D.
无法确定
【简答题】A．mat B．what C．how D．whom
【多选题】According to the professor, what did the Soil Erosion Act do to improve soil conservation? Choose 2 answers.
A.
It provided special equipment for farmers.
B.
It encouraged farmers to use better farming techniques.
C.
It turned damaged farmland into permanent grassland.
D.
It increased the variety of crops grown on each farm.
【单选题】What is most likely to happen to rainwater when it falls on sandy soil?
A.
It sinks in slowly, days later the soil is still saturted.
B.
It sinks in quickly, a few hours later the soil is almost dry.
C.
It runs off the surface and does not enter the soil.
D.
It cracks the surface of the soil.
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