The content of（）in plant seeds is lower than that in stems and leaves（）
A. Protein
B. Fat
C. Nitrogen-free extract
D. Crude fiber
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Primary moisture is also called（）
A. Free water
Bound water
C. Unbound water
D. irreducible water
E. Adsorbed water
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
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