题目内容
（请给出正确答案）
What caused the blackout in July 1977？
A. During a storm, lightning damaged cable.
B. Because of unemployment.
C. Heat waves had made people use too much electrical power.
D. Because the looters damaged the electricity supply.
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更多“What caused the blackout in Ju…”相关的问题
What has caused the chronic organ shortage？
［A］ a decrease in donation rates. ［B］ inefficient governmental policy.
［C］ illegal trade in human organs. ［D］ news media’s indifference.
The show should have started an hour ago; I don’t know what could have caused the ().
A、alarm
B、delay
C、statement
D、custom
What is said about the over 100 aircraft incidents in the past 15 years？
A．They may have been caused by the damage to the radio systems.
B．They may have taken place during take - off and landing.
C．They were proved to have been caused by the passengers' portable computers.
D．They were suspected to have resulted from electromagnetic interference.
A.The fact that the mother has not got any brother.
B.the fact that the father has got his own house and lan
C.The changes in economic relations.
D.The changes in family relationships.
What do we know about Milly from the story？
A. She was seriously ill.
B. She was hidden somewhere.
C. She had met with an accident.
D. She had caused a scandal.
What is said about the over l00 aircraft incidents in the past 15 years？
A.They may have been caused by the damage to the radio system．
B.They may have taken place during take-off and landing．
C.They were proved to have been caused by the passengers’portable computers．
D.They were suspected to have resulted from electromagnetic interference．
What is color？ Why do some objects look red, others green, others blue？
Color is caused by reflected light rays. We see color because objects reflect light. Some thing that is red reflects mostly red light. In the same way, a green object reflects mostly green light. White objects reflect all colors of light. Black objects do not reflect any light.
What happens to the colors of light that are not reflected？ They are absorbed by the object. The darker the color, the less light is reflected and the more light is absorbed. Light that is absorbed is turned into heat. For this reason, dark-colored clothes are warmer in the sunlight than light-colored clothes.
Which is the main idea of this passage？
A．Dark-colored clothes are warmer in the sunlight.
B．Objects absorb part of the sunlight.
C．Color is caused by reflected light rays.
D．A red object reflects mostly red light.
A.A prohibition from loading a cargo from a country when the cargo may be a carrier of infectious diseases
B.Arrest of a vessel by legal authorities to satisfy claims through exercise of a maritime lien
C.Damage caused by riot of the population of a port
D.Losses caused by fines from polluting the harbor after malfunction of a piping system
Judging from this passage, people of the Middle Ages probably ______.
A. treated black cats with respect
B. treated black cats badly
C. were witches if they had black cats
D. thought black cats were beautiful
According to the passage，what is the difference between tidal waves and tides？
A.Tidal waves are caused by underwater earthquake，but tides are not．
B.Tidal waves have regular rise and fall，but tides have not．
C.Tidal waves can be prevented，but tides can not．
D.Tidal waves can hit the land，but tides can not．
