【简答题】Trees are useful to man in three important ways: they give him wood and other useful things, they give him cool places, and they help to stop drought and flood. Unluckily, in many parts of the world, ...
【简答题】Without plant, people could not live. We eat plants. We breathe the oxygen(氧气)that plants produce. And we need plants for another reason: we need them for their beauty. Imagine a world with no plants....
【简答题】Trees are useful to man in three important ways: they give him wood and other useful things, they give him cool places, and they help to stop drought and flood. Unluckily, in many parts of the world, ...