题目内容
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A．Some sea creatures developed vertebrae.
B．The first giant squid was captured.
C．Some sea creatures shed their shells.
D．Sea life became more intelligent.
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更多“A．Some sea creatures developed…”相关的问题
A．Some sea creatures developed vertebrae.
B．The first giant squid was captured.
C．Some sea creatures shed their shells.
D．Sea life became more intelligent.
According to the woman what happened 200 to 500 million years ago？
A．Some sea creatures developed vertebrae.
B．The first giant squid was captured.
C．Some sea creatures shed their shells.
D．Sea life became more intelligent.
Where is the good place for living creatures in the sea？
A．The deep water area of the sea.
B．The end of the flat area.
C．The shallow water area near the continents.
D．Any place on the sea floor.
The noise that affects sea creatures conies from the following EXCEPT
A．industrial underwater explosions.
B．ocean drilling.
C．bathing beach.
D．ship engines.
The space animal theory would seem to indicate that ________.
A．living creatures are extremely adaptable
B．life in space is impossible for man
C．the fittest creatures always survive
D．life cannot exist in the depth of the sea
The space animal theory would seem to indicate that ______.
A．living creatures are extremely adaptable
B．life in space is impossible for man
C．the fittest creatures always survive
D．life cannot exist in the depth of the sea
A.various strange fishes he had never seen
B.some small creatures that ate a lot
C.some unknown small primitive sea animals
D.many sunken wrecks
According to the passage, some people's impression of seals is that ______ .
A．they are the cleverest creatures in the sea
B．they are good at swimming
C．they are the fairies of the sea
D．they are our friends
Which of the following statements is TRUE according to the passage？
A．The author already knew a lot about the Maldive Islands before he did research work there.
B．The climate has nothing to do with the varieties of sea creatures around the coral reef.
C．It is more difficult to find ten different kinds of animals than to find ten animals of the same kind around a tropical coral reef.
D．It was not until recently that people began to dive in the tropical seas.
Certainly no creature in the sea is odder than the common sea cucumber(海参). All living creatures, especially human beings, have their peculiarities, but everything about the little sea cucumber seems unusual. What else can be said about an odd animal that, among other eccentricities, eats mud, feeds almost continuously day and night but can live without eating for long periods, and can be poisonous hut is considered supremely edible by gourmets(美食家) ？
For some fifty million years, despite all its eccentricities, the sea cucumber has subsisted on its diet of mud. It is adaptable enough to live attached to rocks by its tube feet, under rocks in shallow water, or on the surface of mud fiats. Common in cool water on both Atlantic and Pacific shores, it has the ability to suck up .mud or sand and digest whatever nutrients are present.
Sea cucumbers come in a variety of colors, ranging from black to reddish-brown to sandcolor and nearly white. One form. even had vivid purple tentacles. Usually the creatures are cucumbers-shaped——hence their name——and because they are typically rock inhabitants, this shape, combined with flexibility, enables them to squeeze into narrow cracks where they are safe from predators and ocean currents.
Although they have voracious appetites, eating day and night, sea cucumbers have the capacity to become inactive and live at a low metabolic rate feeding sparingly or not at all for long periods, so that the marine organisms that provide their food have a chance to multiply. If it were not for this faculty, they would devour all the food available in a short time and would probably starve themselves out' of existence.
But the most spectacular thing about the sea cucumber is the way it defends itself. Its major enemies are fish and crabs, when attacked, it squirts all its internal organs into the water. It also casts off attached structures such as tentacles. The sea cucumber will eviscerate排除内脏) and regenerate itself if it is attacked or even touched; it will do the same if the surrounding water temperature is too high or if the water becomes too polluted.
The passage is mainly about______.
A．the reason for the sea cucumber's name
B．ways to identify the sea cucumber
C．places where the sea cucumber can be found
D．the peculiarities that make the sea cucumber unusual
