TPO2 The origins of cetaceans - 英檢

同學你好：
the presence of a blowhole後面的動作是不能掩飾（cannot disguise）
他們和陸地上哺乳動物的類同

→換個方式說，就是答案（2）
conceal＝disguise
答案（4）不合理，因為presence of a blowhole後面完全沒提到not yield clues的內容
。


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※ 引述《pichu7 ()》之銘言：
: It should be obvious that cetaceans-whales, porpoises, and
: dolpins-are mammals. They breathe through lungs, not through gills,
: and give birth to live young. Their streamedlined bodied, the
: absence of a hind legs, and the presence of a fluke and blowhole
: cannot disguise their affinities with land dwelling mammals.
: However, unlike the case of sea otters amd pinnipeds (seals, sea
: lions, and walruses, whose limbs are functional both on land and
: at sea), it is not easy to envision what the first whales looked
: like. Extinct but already fully marine cetaceans are known from the
: fossil record. How was the gap between a walking mammal and a
: swimming whale bridged? Missing until recently were fossils clearly
: intermediate, or transitional, between land mammals and cetaceans.
: 題目
: 1. In paragraph 1, what dose the author say about the presence of
: a blowhole in cetaceans?
: 答案為(2)It cannot conceal the fact that cetaceans are mammals.
: 我選(4)It cannot yield clues about the origins of cetaceans.
: 請問為什麼答案不是(4)??

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