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举一反三
【单选题】Water— the Issue of This Century The world is running short of fresh water．Populations are growing bigger and thirstier(渴的), with the result that fresh water is becoming increasingly scarce(缺乏)．Half t...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Text 2 We recently sailed with our research ship through the Red Sea to the Indian Ocean where we did research work for about a year. Our main objectives (目标) were the little-known Maldi...
A.
the coral reef exists in regions with warm climate
B.
the coral reef provides favorable living conditions for them
C.
the creatures are away from the danger of being eaten by sharks
D.
most sea creatures feed on the colourful coral
【单选题】生态系统的能量流动是指（）
A.
太阳能被绿色植物固定的过程
B.
生态系统内生物体能量代谢的过程
C.
生态系统内伴随物质循环的能量转移过程
D.
能量从生物体进入环境的过程