A.marine plants and marine animals
B.two types of sea plants
C.three kinds of sea animals
D.small and big animals in the ocean
答案 A [主旨大意题。本文主要讲述了海洋生物的分类(海洋植物和海洋动物)以及他们的特点。]
22.Why can't we find the rooted plants in deep water of the ocean?
A.Because there are too many rocks at the bottom of the ocean.
B.Because the rooted plants can't stand the coldness of the ocean.
C.Because there is not enough sunlight for them in deep water.
D.Because the rooted plants need more sunlight than plants which have no roots.
答案 C [细节理解题。根据第二段可知,有根植物不能生存在很深的海底是因为那儿没有充足的阳光来进行光合作用。]
23.One of the characteristics of zooplankton is that ________.
A.they are small and never grow to large size
B.some of the zooplankton can't swim effectively
C.they can swim freely in deep water of the ocean
D.they need more sunlight than other animals in the ocean
答案 B [细节理解题。根据第四段最后一句可知,有些zooplankton不能自己有效地推进自己,也就是说它们不能有效地游泳。]
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