What is the key solution to environmental problem？
A. Solar panel technology.
B. Permaculture.
C. Industrialism.
D. Not mentioned in the passage.
一个两位数，十位上的数字是个位上的数字的2/3，把十位上与个位上的数字调换后，新数比原数大18，则原来这个两位数的两个数字和是：
A. 12
B. 10
C. 8
D. 21
What statement is false according to the passage？
A. Natural resources are not renewable.
B. Living creatures depend on plants.
C. Both individuals and corporations are responsible for the degradation of ecology.
D. Fortunately we haven't suffered from what we have done to nature.
Which of the following is NOT a natural devastation？
A. Cut trees.
B. Abuse land.
C. Destroy animal quarters.
D. Application of solar energy.
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