問題詳情

▲ 下篇短文共有5個空格，為第11−15題，請依短文文意，選出一個最適合該空格的答案。  Natural Selection, a theory developed by Charles Darwin in the 1800s, explains how thefeatures of a species can change over many generations. These changes may take different forms.Sometimes, a plant or animal may develop completely new characteristics which enable it tolive successfully in a new habitat. 11 , evidence indicates that the dolphin’s ancestors oncelived on land. To this day, dolphins breathe air through lungs, just as land animals do. However,we know them as water animals because they live in water and have developed features thatmake them good swimmers. 12 , living things may also develop new features permittingthem to endure in their own habitat. Take polar bears as an example; not all polar bears havealways been white. In the past, the white polar bears 13 well with their environment, sothey were more successful in escaping from predators. While their dark colored peers werekilled more frequently, the white polar bears survived to 14 so that their numbers grew.Sometimes the habitat of a species will change in some way. This change may force the speciesto either move to a new habitat or adapt to the changed habitat. One example of a species thatadapted to a new area is the peppered moth. Peppered moths 15 in the forests of Englandfor thousands of years. They rest on the trunks of trees during the day and, while resting, are thediet of many birds. Peppered moths vary in color, from light-colored to dark-colored. In theunpolluted area, more light-colored moths survive. In the polluted area, more dark-colored mothssurvive.
11.
(A) After all
(B) For example
(C) By contrast
(D) On the other hand

參考答案

答案：B
難度：簡單0.8
統計：A(0),B(8),C(0),D(0),E(0)

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