18. Europa is the most recently discovered one among Jupiters
A. Right B. Wrong C. Not mention
答案:C
19. The size of Europa is a bit larger than that of Earths moon.
A. Right B. Wrong C. Not mention
答案:B
20. Schmidt and her colleagues are the first group of scientists xxxxx Europa.
A. Right B. Wrong C. Not mention
答案:B
21. The formations on Europas surface are rather unique in the
A. Right B. Wrong C. Not mention
答案:B
22. The existence of liquid water is a necessity for a life-support
A. Right B. Wrong C. Not mention
答案:A
三、概括大意与完成句子
Learn about Noble Gases(惰性气体)
1 Have you ever ridden on a balloon? Many tourist spots offer balloon rides in order for people to see the beauty of a place from above. A balloon contains a noble gas called helium(氦). Formerly, balloons contained hydrogen but hydrogen is very flammable and dangerous when uncontrolled. Therefore, people shifted to helium, which is safer. Helium is safe because it has the properties of the noble gases.
2 People once believed that noble gases couldnt chemically react at all. For this reason, they were called inert gases(惰性气体). They were also listed under Group 0 in the old periodic table because scientists believed that the gases have zero valence(价) electrons in their outer shell. This was later proven to be untrue when some noble gas compounds were discovered.
【2012年职称英语考试理工类A级试题及答案】相关文章:
最新
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02