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精英家教網 > 高中英語 > 題目詳情

Living things need air and sunlight _______ water.


  1. A.
    except
  2. B.
    but
  3. C.
    not only
  4. D.
    as well as
D
解析:
空氣、陽光和水是生命主要要素,缺一不可。
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For more than twenty years scientists have been seeking to understand the mystery of the‘‘sixth sense"of direction.By trying out ideas and solving problems one by one,they are now getting closer to one answer.

One funny idea is that animals might have a built-in compass(指南針).

Our earth itself is a big magnet(磁體).So a little magnetic needle that swings freely lines

itself with the big earth magnet to point north and south.When people discovered that idea about athousand years ago and invented the compass,it allowed sailors to navigate (航海)on oceanvoyages, even under

cloudy skies.

 Actuallly the idea of the living compass came just from observing animals in nature.

 Many birds migrate twice a year between their summer homes and winter homes.Some of them fly for thousands of kilometers and mostly at night.Experiments have shown that some birds can recognize star patterns.But they can keep on course even under cloudy skies.How can they do that?

A common bird that does not migrate but is great at finding its way home is the homing pigeon.Not all pigeons can find their way home.Those that can are very good at it,and they have been widely studied.

One interesting experiment was to attach little magnets to the birds’ heads to block their

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Passage outline

Supporting details

The existence of the earth magnet and the invention of the navigating compass

◇Our earth is a big magnet and a little freely (71)   ▲ 

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◇(72)   ▲   on the idea above, the navigating compass was invented.

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The  (75)   ▲     on pigeons’ and bees’ built-in compasses

◇Little magnets were tied to the pigeons’ heads to (76)   ▲     their magnetic sense.

◇The pigeons’ magnetic sense seemed to be affected on (77)   ▲    days.

◇Similar things with the same results were done with bees.

The  (78)   ▲     of the magnetic stuff for the animal compass

◇Little rod-like bacteria were found by chance to swim together in the direction of (79)   ▲    .

◇Some animals had a chain of dense magnetic particles in or close to the (80)   ▲     inside their bodies.

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