We use the terms combustion and oxidation when we talk about _______.

试卷相关题目

• 1Nuclear energy is a special sort of_____

  A.uranium

  B.chemical energy

  C.radiant energy

  D.electricity generated in atomic plants

  开始考试点击查看答案
• 2In a toaster, _______ energy becomes heather gy.

  A.electrical

  B.mechanical

  C.heat

  D.radiant

  开始考试点击查看答案
• 3At he beginning of the Games in the host country _______

  A.a torch is ignited at sunrise

  B.a lighted torch is brought into the stadium

  C.relays of runners light their torches in the stadium

  D.a torch is ignited by the Greek ambassador

  开始考试点击查看答案
• 4The continuity of the Olympic Games_______.

  A.has never been broken

  B.was broken in the year A.D. 1200

  C.was interrupted for over 1,500 years

  D.was broken in 1896

  开始考试点击查看答案
• 5Modern athletes’ results cannot be compared with those of the ancient runners because _______.

  A.the Greeks had no means of telling the time

  B.details such times were not recorded in the past

  C.they are much better

  D.the ancient runners fell down dead

  开始考试点击查看答案
• 6From the facts given in this article we can tell that _______

  A.often a form of energy is useless to us until it becomes another form

  B.steam power is cheaper and better than electrical power

  C.in the near future, there will be enough nuclear power to supply all our energy needs

  D.energy can change to another form, but the new form cannot change hack into the old form

  开始考试点击查看答案
• 7Scientists expect that the atomic clocks will be_______.

  A.more durable

  B.indestructible

  C.more precise

  D.absolutely accurate

  开始考试点击查看答案
• 8From the selection, we may assume that temperature changes _______

  A.affect only ammonia molecules

  B.may affect the vibration rate of atoms

  C.affect the speed at which atoms travel

  D.do not affect atoms in any way

  开始考试点击查看答案
• 9Identical atomic clocks may be used to check_____

  A.the accuracy of predictions based on theories of relativity

  B.all of Einstein's theories

  C.the effect of outer space on an atomic clock

  D.the actual speed of an orbiting satellite

  开始考试点击查看答案
• 10Which is implied but not stated、

  A.Precise timekeeping is essential in science.

  B.Scientists expect to disprove Einstein's relativity theories.

  C.Atomic clocks will be important in space flight.

  D.The rate of vibration of an atom never varies.

  开始考试点击查看答案