Energy equals mass times the speed of
light squared. This is the famous equation of Albert Einstein. It{{U}} (51)
{{/U}}to the category of the theory of relativity, and it equates energy
with mass.
All things are made up of atoms. When{{U}} (52)
{{/U}}of an atom travels at almost the speed of light{{U}} (53)
{{/U}}we put more energy into it to increase the speed, it begins to in
crease in mass. The energy that makes it travel fast cannot make it travel{{U}}
(54) {{/U}}the speed of light—nothing{{U}} (55) {{/U}}light
can travel that fast- so the energy goes into the thing{{U}} (56)
{{/U}}and increases its mass. Energy{{U}} (57) {{/U}}into
mass.
Why is the theory called the theory of relativity A thing
that is relative depends upon{{U}} (58) {{/U}}else to identify it
A. equal
B. similar
C. opposite
D. subject
更多"阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内"的相关试题:
[单项选择] 阅读下面的短文，文中有15处空白，每处空白给4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
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Where Did All the Ships Go
The Bermuda Triangle (三角区) is one {{U}} (51) {{/U}} the greatest
mysteries of the ses. In this triangular area between Florida, Puerto Rico
and Bermuda in Atlantic, ships and airplanes {{U}} (52) {{/U}} to
disappear more often than in {{U}} (53) {{/U}} parts of the ocean. And
they do so {{U}} (54) {{/U}} leaving any sign of an accident or any dead
bodies. It is {{U}} (55) {{/U}} that Christopher Columbus was the first
person to record strange happenings in the area. His compass stopped working, a
flame came down from the sky, and a wave 100 to 200-feet-high carried his ship
about a mile away.
The most famous disappearance in the Bermuda
Triangle was the US Naval (海军的) Air Flight 19．{{U}} (56) {{/U}} Decembe
A. from
B. of
C. about
D. on
[单项选择] 阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
Many people wrongly believe that when
people reach old age,-their families place them in nursing homes. They are left
in the{{U}} (51) {{/U}}of strangers for the rest of their lives.
Their{{U}} (52) {{/U}}children visit them only occasionally, but more
often, they do not have any regular visitors. The truth is that this idea is an
unfortunate myth-an{{U}} (53) {{/U}}story. In fact, family members
provide over 80 percent of the care{{U}} (54) {{/U}}elderly people need.
Samuel Prestoon, a sociologist, studied{{U}} (55) {{/U}}the American
family is changing. He reported that by the time the average American couple
reaches 40 years of age, they have more parents than children{{U}} (56)
{{/U}}, because people today live longer after an illness than people did
years{{U}} (57) {{/U}
A. hands
B. arms
C. bodies
D. homes
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