Why are organic vegetables not always safe?A.Because they contain more chemicals.B.Because

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Why are organic vegetables not always safe?

A.Because they contain more chemicals.

B.Because they can make people less resistant to sunshine.

C.Because some chemicals in them can be potential dangers.

D.Because their genes are modified to some degree.

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热搜:a是b的充分条件,b是a的必要条件吗