Primary moisture is also called（）
A. Free water
Bound water
C. Unbound water
D. irreducible water
E. Adsorbed water
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Expressions of net energy for production（NEp）are not included（）
A. Weight gain
B. Hair production
C. Service
D. Breathing
To solve the crisis of man-nature relation, we should _____（）
A. lay the entire responsibility on enterprises and government
B. close down all the factories and stop industrial production
C. use such fossil fuels as coal, crude oil and natural gas
D. find a rational balance between production and care for Mother nature
Which of the following is irreplaceable resource（）
A. solar energy
B. petroleum
C. wind power
D. tidal energy
Which one is NOT the description of our ancestors in the past（）
A. They could easily get natural resources with their perfect tools
B. They lived in fear of nature’s destructive forces
C. They were often unable to obtain the merest daily necessities
D. They viewed forest as something wild and frightening
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