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(A) No one knows if the ban will be enforceable, but at least it is on the books.
(B) Over the past years there have been a couple of very positive developments.
(C) A handful, including the great white shark, may ultimately face total biological extinction.
(D) It is estimated that roughly 100 million sharks are saved worldwide by fishermen every year.

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統計： A(10), B(25), C(172), D(21), E(0) #569916

黑色五葉草魚

B2 · 2018/09/11

#2990385

Of the more than 350...

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B1 · 2017/11/18

#2493351

文章一開始說到鯊魚瀕危亡，18空格後，論及鯊魚的生物學情形才是其最大問題。

18題選項：A)沒人知曉禁令是否強制，但至少它是在書上。;B)過去幾年來，有一些非常積極的發展。;C)包括大白鯊在內的一小撮可能最終將面臨徹底的生物滅絕。D)據估計，每年有大約1億鯊魚在全世界被漁民拯救。依上下文，C較合文意。