第1题
A.Cut trees.
B.Abuse land.
C.Destroy animal quarters.
D.Application of solar energy.
第2题
A.it is invented
B.it is changing
C.it has a complex language system
D.it can be used naturally
第4题
A.spontaneously
B.simultaneously
C.homogeneously
D.instantaneously
第6题
A.It is a natural development.
B.The problem is not very serious.
C.It is a very worrying problem.
D.The situation will improve in time.
第7题
A.It is a natural development.
B.The problem is not very serious.
C.It is a very worrying problem.
D.The situation will improve in time.
第8题
A.It is a natural development.
B.The problem is not very serious.
C.It is a very worrying problem.
D.The situation will improve in time.
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