Food security is already at risk because of soil erosion and the volatility of oil and gas
A、pragmatic and hypocritical
B、cautious and inconsistent
C、daring and opportunistic
D、intense but fleeting
E、strong but prudent
A、All of them are the enzymes that catalyze intermediate reactions of metabolisms.
B、They have higher catalytic activities in enzyme systems.
C、The regulation of the enzyme activity does not affect the metabolic rate of the whole system.
D、All reactions catalyzed by key enzymes are reversible.
A、congested
B、contagious
C、polluted
D、epidemic
A、1860
B、1855
C、1872
D、1892
A、to construct the model of experience
B、to construct the logic relations.
C、to construct grammar
D、to constract lexicon
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