下载APP
举一反三
【单选题】Water Resource Humanity uses a little less than half the water available worldwide. Yet occurrences of shortages and droughts (干旱) are causing famine and distress in some areas, and industrial and agr...
A.
build big lakes to store water
B.
construct big pumping stations
C.
build small and cheap irrigation systems
D.
channel water from nearby rivers to cropland
【多选题】麦叶爪螨和麦岩螨的共同习性包括（ ）。
A.
都以成螨和卵越冬，以滞育卵越夏
B.
春秋两季为害，以春季为害严重
C.
在叶背为害
D.
对大气湿度较为敏感，遇小雨或露水大时即停止活动