262.30 % of the young trees, attacked by diseases, ________pine trees.
A: is
B: are
C: was
D: has been
A: is
B: are
C: was
D: has been
举一反三
- One-third of the area _____ covered with green trees. About seventy percent of the trees ____ been planted. A: are; have B: is; has C: is; have D: are; has
- One-third of the area _______ covered with green trees, and about seventy percent of trees _______ been planted. ( ) A: are; has B: is; has C: are: have D: is; have
- Maple trees are thought to be fall color trees or foliage trees.
- One-third of the area _____ covered with green trees. About seventy percent of the trees _____ been planted.
- Why do forests in many parts of the world slowly disappear（） A: New trees are not looked after properly. B: Many trees have been cut down by man. C: Man has not paid enough attention to planting trees. D: All of the abov