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【单选题】
钢中气体通常指溶解在钢中的A.
[H]、[C]、[N]
B.
[H]、[O]
C.
[H]、[N]
D.
[N]、[O]
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【单选题】What can be inferred from Paragraph 4?
A.
Unpackaged products are of bad quality.
B.
Supermarkets care more about packaging.
C.
It is improper to judge quality by packaging.
D.
Other products are better packaged than food.
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