单选题 Read the following text. Choose the best word or phrase for
or phrase each numbered blank and mark A, B, C or D on ANSWER SHEET
1.
It is an astonishing fact that there are laws of
nature, rules that summarize conveniently - {{U}}(21) {{/U}}
qualitatively but quantitatively - how the world works. We might {{U}}(22)
{{/U}} a universe in which there are no such laws, in which the 108
elementary particles that {{U}}(23) {{/U}} a universe like our own
behave with utter and uncompromising abandon. To understand such a universe we
would need a brain {{U}}(24) {{/U}} as massive as the universe. It seems
{{U}}(25) {{/U}} that such a universe could have life and intelligence,
because being and brains {{U}}(26) {{/U}} some degree of internal
stability and order. But {{U}}(27) {{/U}} in a much more random universe
there were such beings with an intelligence much {{U}}(28) {{/U}} than
our own, there could not be much knowledge, passion or joy. {{U}}
(29) {{/U}} for us, we live in a universe that has at least important
parts that are knowable. Our common-sense experience and our evolutionary
history have {{U}}(30) {{/U}} us to understand something of the workaday
world. When we go into other realms, however, common sense and ordinary
intuition {{U}}(31) {{/U}} highly unreliable guides. It is stunning that
as we go close to the speed of light our mass {{U}}(32) {{/U}}
indefinitely, we shrink toward zero thickness {{U}}(33) {{/U}} the
direction of motion, and time for us comes as near to stopping as we would like.
Many people think that this is silly, and every week {{U}}(34) {{/U}} I
get a letter from someone who complains to me about it. But it is virtually
certain consequence not just of experiment but also of Albert Einstein's
{{U}}(35) {{/U}} analysis of space and time called the Special Theory of
Relativity. It does not matter that these effects seem unreasonable to us.
We are not {{U}}(36) {{/U}} the habit of traveling close to the
speed of light. The testimony of our common sense is suspect at high velocities.
The idea that the world places restrictions on {{U}}(37)
{{/U}} humans might do is frustrating. Why shouldn't we be able to have
intermediate rotational positions? Why can't we {{U}}(38) {{/U}} faster
than the speed of light? But {{U}}(39) {{/U}} we can tell, this is the
way the universe is constructed. Such prohibitions not only {{U}}(40)
{{/U}} us toward a little humility; they also make the world more knowable.