18.Seamounts are mountains,usually volcanoes,which rise up from the sea floor.Some of the volcanoes are dead,some are still active.But they are hard to fin because they do not reach the surface of the water.
Scientists say seamounts cover more of the earth's area than deserts,tundra(凍原),or any other land-based habitats.Marine life gathers at seamounts because they carry nutrient-rich water upward form the sea floor.
In September,a group of scientists set out to explore Cook Seamount.It rises almost 4,000meters from the Pacific Ocean floor about 160 kilometers off the island or Hawaii,Humans have never seen it up close before.The Associated Press went with the scientists,and provided unique images and information about this seamount and the marine life around it.
Three people went in a submarine(潛艇)down to over 900meters below the ocean surface to the top of the seamount.As the blue waters became darker,underwater creatures that glow,by chemically creating their own light,began to swim past the submarine.The scientists dove below the level where sunlight can reach.They spotted some wonders-like a rare octopus(章魚)with big fins that look like elephant ears.One even changed colors as it swam by the submarine.
Cook seamount is an extinct volcano,which means it is not active anymore.It is part of a group or undersea volcanoes known as the Geologist Seamounts,that are about 80 million years old and could hold many new animal species.They could also contain elements such as nickel and cobalt that mining companies could extract.
32.Why dose ocean life like gathering at seamounts?B
A.Because seamounts can protect them from being attacked.
B.Because there is plenty of food to feed.
C.Because there is plenty of air to breathe.
D.Because the rising water can bring them to ocean surface.
33.Form the fourth paragraph,we can infer thatD.
A.the deeper the ocean is,the bluer it is
B.the deeper the ocean is,the more sea creatures there are
C.octopuses live in the deep ocean where there id little sunlight
D.octopuses live in the deep ocean where there is little sunlight
34.What dose the underlined word"extinct"in paragraph 5 probably mean?C
A.positive
B.negative
C.dead
D.endangered
35.What passage is most likely taken fromB.
A.a(chǎn)n adventure diary
B.a(chǎn) science exploration report
C.a(chǎn) science fiction
D.a(chǎn) social investigation podster.