問題詳情

依下文回答第 41 題至第 45 題    About 110 million years ago, mammals had diverged into two distinct groups, the placental mammals andthe marsupial mammals. These groups evolved in two increasingly different directions with great divergence intheir 41 approaches.     Placental mammals 42 well-developed young. Since placental mammals develop inside their mother’s wombfor an extended period of time, their young are born quite alert and are often able to move about within just a few hours ofbirth. Marsupial mammals’ young, 43 , are less-developed at birth and must crawl up the mother’s abdomen to thesafety of her pouch. 44 inside the pouch, they continue their development until ready to move about on their own.     Comparison reveals that, although placental and marsupial mammals formed separate lineages, they still evolvedsimilar 45 to the environments. In some cases, placental and marsupial mammals even physically resemble eachother. The pouched marsupial mouse and the harvest mouse, the marsupial mole and the common mole, and themarsupial wombat and marmot are some examples.
【題組】41
(A)generative
(B)reproductive
(C)transformative
(D)affirmative

參考答案

答案：B
難度：困難0.275862
統計：A(12),B(16),C(24),D(4),E(0)

用户評論

【WEI】評論

mammal 哺乳類placental 胎盤的marsupial 有袋的evolve 使逐步形成divergence 差異womb 子宮crawl 爬abdomen 腹部pouch 小袋，囊lineage 家系wombat 袋熊marmot土撥鼠

【momou】評論

These groups evolved in two increasingly different directions with great divergence in their reproductive approaches這些群體在兩個不同的方向發展，生殖方式差異很大(A)generative (B)reproductive (C)transformative (D)affirmative（A）生成的 （B）生殖 （C）變革性的 （D）肯定