40.
(A) there are many kinds of greenhouse gases
(B) greenhouse gases are dangerous for our earth
(C) the atmosphere around our earth is getting thinner
(D) our earth would be too cold for life without greenhouse gases

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統計： A(36), B(81), C(56), D(180), E(0) #2716779

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#4966775
前面在講溫室氣體的好處，40格講的是如果...
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