A small blood-sucking creature has been discovered in the Caribbean waters off the Virgin Islands.The creature may help increase scientists’ understanding of how disease is passed among marine animals.This discovery will lead to more information about parasites(寄生生物)and the effect they can have on marine environments.

　　1.The purpose of the text is to 　. 

　　A.introduce a scientific system to monitor the ocean

　　B.talk about the character of the ocean

　　C.present the importance of the ocean

　　D.introduce a rich source for new medicines

　　2.The Ocean Health Index can be described as 　. 

　　A.a protector of the ocean

　　B.the ocean’s doctor

　　C.an observer of the ocean

　　D.the ocean’s mirror

　　3.We can infer from the text that 　. 

　　A.the world’s rainforests are not good places for new medicines

　　B.more medicines are made from the ocean than from rainforests

　　C.the ocean is a very good place for medicine source

　　D.the ocean will replace the rainforests for medicine source

　　4.Why do the scientists value the small blood-sucking creature?

　　A.Because it can help them find out how disease spreads among sea creatures.

　　B.Because it can be used to make medicine to cure marine animals of disease.

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