【单选题】In paragraph 3, the author mentions all of the following characteristics of the sun EXCEPT:
A.
The photosphere is the visible layer of the sun where energy escapes into space as sunlight.
B.
Nuclear fusion takes place in the sun's core and travels outwards through a number of different layers.
C.
The photosphere, which is 100 km thick, has a lower temperature than the sun's outer atmosphere.
D.
The sun has a magnetic core made of liquid iron that is kept in constant motion by the sun's rotation.
【简答题】稳压二极管稳压时是处于 偏置状态,而二极管导通时是处于 偏置状态。
【简答题】稳定二极管稳压时是处于 偏置状态,而二极管导通时是处于 偏置状态。
【简答题】VII. 语法填空 (共10小题;每小题1分,满分10分) The break-up of a relationship can mean sleepless nights, problems concentrating, loss of appetite, even depression. Every person reacts 99 the cr differently...
【简答题】Captain Henry,a 98'year—old American retired fisherman,has become a first—time author.having written and published his autobiography In a Fisherman’s Language after learning to read at the age of 91. ...
【单选题】Question 4. According to the author, _______ should take more responsibilities to reduce emissions. ----- Passage 3 ----- (Para. 1)Climate change has no borders. While fossil fuels are gathered up and...
A.
the US, the UK, Canada and Australia
B.
countries more at risk from climate threats
【单选题】Why does the author mention the Scripps Institute of Oceanography in paragraph 6?
A.
The location near the coast endangers the Scripps facility.
B.
Research at Scripps indicates that the ocean is getting warmer.
C.
One quarter of the rising sea levels has been recorded at Scripps.
D.
Records at Scripps have been kept for nearly one hundred years.