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碧玺是三方晶系矿物常呈三方柱、六方柱、三方单锥、复三方单锥等晶形,柱面纵纹发育,横截面呈球面三角形。()

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统一六国的过程中，最后灭亡的诸侯国是（）。(2014年下半年)

A. 赵
B. 燕
C. 韩
D. 齐

A scholars professional ethics are essential to his career and in a sense determine his contribution to the public. What do the professional ethics really mean, and what is its importance to a scholar？ Write a composition of about 200 words on the following topic: My Idea of Professional Ethics of a Scholar

猫眼是一种名贵宝石品种,其质量好坏主要由透明度、眼线、重量等决定。()
参考答案：错误

Some people say that opportunity is the key element for success. For example, there is a popular story that Newton was sitting under an apple tree, an apple fell on his head (more likely near him) , and he suddenly thought of the Universal Law of Gravitation. How would you comment on this？ Write a composition of about 200 words on the following topic: On Opportunity and Success