【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】碘元素(符号为I)具有预防和治疗甲状腺肿的作用,人体缺碘时易患粗脖子病.为了消除碘缺乏病,我国政府规定居民的食用盐必须是加碘食盐,简称碘盐.所谓碘盐就是在食盐中加入一定量的碘酸钾.所以食盐中常含有一种补充碘元素的盐.右图为湖北省盐业公司专营的“云鹤牌”精制碘盐包装袋上的部分说明文字,请回答下列问题: 配料表 食用盐、碘酸钾 含碘量 (20mg~40mg)/kg 保质期 18个月 食用方法 待食物烹...
【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】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.
【判断题】The author has kept the belief that human potential can be realized by the globalization of ideas since the widespread of Internet.