42. According to the passage, what is the author’s attitude towards the idea of combating food shortage crisis with vertical farming?
(A) Earnest, but with some surprise
(B) Optimistic, but with some reservation
(C) Pessimistic, but hopeful
(D) Sympathetic, but not sensible
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全文大篇幅說明垂直農法，是樂觀的態度，但...
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