問題詳情
Passage AAmphibians help maintain the balance of nature: sometimes because they are food for other animals, including humans;other times because they eat large amounts of insect pests and larvae. However, amphibians are disappearing from areas wherethey __16__ were common. People’s activities appear to be the main cause of this __17__ . Habitats are destroyed as marshesand other wetlands are drained; forests are cut down; home, roads, and other __18__ are built. In many places, amphibians arerun over by cars as they cross the roads built between their homes and their spawning grounds. Chemical substances from acidrain and pesticides also harm amphibians when they are absorbed through their moist skin.As their important contributions have been recognized, efforts have been made to protect them. Measures __19__ bysome countries that protect the environment from the harmful effects of acid rain and the misuse of pesticides also help protectamphibians. Countries, such as India, have banned the export of frog legs ( __20__ a delicacy in some parts of the world). Inmany parts of Europe, toad tunnels have been built to help toads safely cross the roads that block their travel to spawninggrounds.
【題組】16.
(A) therefore
(B) henceforth
(C) whereas
(D) once
參考答案
答案：D
難度：簡單0.8
統計：A(4),B(2),C(1),D(32),E(0)
用户評論
【用戶】寶小鳳
【年級】大一下
【評論內容】henceforth 從此以後