The author describes trees as all of the following EXCEPT______.
A.tall
B.green
C.massive
D.long-lived
The leaves of many trees turn ______ in autumn.
A.to red
B.red
C.to be red
D.into red
The island had______.
A.a lot of vegetation but no trees, bushes or flowers
B.rio vegetation(植物) or wildlife
C.plentiful supplies
D.a few birds and animals
______ more attention, the young trees could have grown much letter.
A.To give
B.Given
C.Giving
D.Having given