_____
Bob and his two friends went to the forest to watch the trees in the forest.
The people in this city have planted()trees along both sides of the streets.
At last,the palm trees that fringe the natural harbor of Port Aloahoa come into view on the horizon lit by the setting sun.The meaning of this sentence is that ().
Why does land become desert after all trees are cut down?
What is the most important service of trees to man according to the passage?
Rainforest trees tightly rely on microorganisms.
____
英语单词“trees”中“s[z]”的作用是()。