33. According to the passage, why were early modern dancers criticized by dance critics?
(3)
(A) They performed mainly in Europe.
(C) They were not formally trained.
(D) Lightness of movement.
(B) They danced to classical music.
(D) They imitated the techniques of ballet.
To us, the environment in which fish dwell often seems cold, dark, and mysterious. But there are
advantages to living in water, and they have played an important role in making fish what they are.
One is that water is not subject to sudden temperature changes. Therefore, it makes an excellent
habitat for a cold-blooded animal. Another advantage is the water's ability to easily support body
weight. Protoplasm has approximately the same density as water, so a fish in water is almost weightless.
This "weightlessness” in turn means two things: One, a fish can get along with a light weight and
simple bone structure, and two, limitations to a fish’s size are practically removed.
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Yet there is one basic difficulty of living in water—the fact that it is incompressible. For a fish
to move through water, it must actually shove it aside. Most can do this by wiggling back and forth
in snakelike motion. The fish pushes water aside by the forward motion of its head, and with the curve
of its body and its flexible tail. Next, the water flows back along the fish’s narrowing sides, closing
in at the tail, and helping the fish propel itself forward.
The fact that water is incompressible has literally shaped the development of fish. A flat and
angular shape can be moved through water only with difficulty. For this reason, fish have a basic
shape that is beautifully adapted to deal with this peculiarity.
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