Official 26 Lec 2
Question 5 of 6
What point does the professor make when she talks about cadmium being poisonous to humans?

A.

That cadmium and zinc can serve a similar function in plant enzymes

B.

That both cadmium and zinc are rare in plant enzymes

C.

That most trace metals are poisonous to humans

D.

That cadmium does not serve any biological purpose

正确答案:A

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