Let us take a brief look at the planet
on which we live. As Earth hurtles through space at a speed of 70,000 miles an
hour, it spins, as we all know, on its axis, which causes it to be flattened at
the Poles. Thus if you were to stand at sea level at the North or South Pole,
you would be 13 miles nearer the centre of the earth than if you stood on the
Equator. The earth is made up of three major layers — a central
core, probably metallic, some 4000 miles across, a surrounding layer of
compressed rock, and to top it all a very thin skin of softer rock, only about
20 to 40 miles thick — that’s about as thin as the skin of an apple, talking in
relative terms. The pressure on the central core is
unimaginable. It has been calculated that at the centre it is 60 million pounds
to the square inch, and this at a temperature of perhaps 10,000 degrees
F A. ( There is great pressure at the centre B. ( Earthquake waves can move vertically C. ( The outer layer is made of rock D. ( The heat at the centre is too great
[简答题]
[单项选择]
Many people will have heard of the
Alexander technique but have only a vague idea what it is about. Until earlier
this year, I didn’t have the faintest idea about it. But, hunched over a
computer screen one day, I noticed that the neck-and backache I regularly
suffered were more painful than usual. I consulted a doctor, who said: "I can
treat the symptoms by massaging your neck and upper back. But you actually have
bad posture. That is what you need to get sorted out. Go off and learn the
Alexander technique." I had regularly been told by friends and
family that I tend to slouch in chairs but had thought bad posture was something
one was born with and could do nothing about, That is not true. Dentists and car
mechanics, among others, tend to develop bad posture from leaning over patients
or engine bays. Mothers often stress and strain their necks and A. ( are learnt through one-to-one tutorial B. ( need more energy and effort than we think C. ( are not to be performed strenuously D. ( are not required in the exercise
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