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【多选题】
水土保持工程社会效益主要包括A.
保护公路、铁路的交通安全
B.
延长水库寿命和养活渠系维修
C.
减少泥沙对下游河道、水库和其它水利工程的危害
D.
减轻山洪、泥石流等灾害
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A.
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B.
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C.
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D.
Some students have become millionaires after they drop out.
【简答题】Young people can have problems with their minds. Some students become worried because they have to study very hard. Others have trouble getting on well with people like their parents and classmates. L...
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