亚洲鲤鱼会对北美五大湖的生态系统造成严重破坏。本文介绍了四种亚洲鲤鱼。
5.Which of the following swim lowest in the water?
A.Grass carp.
B.Bighead carp.
C.Black carp.
D.Silver carp.
解析 细节理解题。根据最后一段第二句While their relatives feed themselves on plants and plankton overhead,black carp stay low to hunt snails and mussels可知,青鱼喜欢生活在水的底层。
答案 D
6.According to the text, grass carp ________.
A.are hunted mainly for food at present
B.were kept to clean fish farms at first
C.were introduced to America in the 1970s
D.appeared in the Mississippi River in the 1980s
解析 细节理解题。根据第二段第二句They were introduced in the hope that they’d control pond weeds and other unwanted vegetation at fish farms可知,美国人最初引入草鱼是为了清理鱼塘。
答案 B
7.We can learn from the text that ________.
A.grass carp consume too much food that native fish rely on
B.bighead carp are a species of Asian carp that only feed on algae
C.silver carp were the first kind of Asian carp to invade America
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