问题 问答题 简答题

简述相标志的主要类型及其环境意义。

答案

参考答案:

(1)岩石学标志:①岩石类型和矿物成分:指示沉积环境、物源区性质、构造状况和古气候条件;②沉积岩的结构:指示水流性质-如杂基含量;

③沉积构造(如层理、层面构造):指示介质动力条件和流体性质、提供古水流资料,解释沉积环境。

④颜色:指示沉积环境的Eh值(氧化还原性质)。

(2)古生物和古生态标志:确定沉积时的自然地理环境最有效,指示时沉积时的水深、盐度和浊度;如遗体和遗迹化石。

(3)地球化学标志:岩石或生物介壳中的微量元素、同位素和有机地化资料解释沉积环境。

阅读理解

C

Every once in a while, it is necessary to take a step back in order to take a long, hard look at where we are in our lives. At this point, it is good to ask yourself a bunch of critical questions. Have you so far accomplished all of your goals in life ? If so, you have not accomplished your goals in life, then perhaps you have made the mistake of setting too many goals or trying to accomplish them at an unnaturally fast pace.

It is necessary to set reasonable, intelligent goals in order to succeed in life. Do not be unrealistic because life is not a fairy tale. But you should try to recognize what you want,when attempting to visualize(形象化) or otherwise express what your goals in life are.

In order for a goal to sufficiently motivate you, it needs to be a major one. The bigger your goals are, then the more motivated you will need to be to work towards accomplishing them. If you want, you are a beginner, then no doubt mastering those tough songs is a very intelligent and realistic goal to set. But if that is your only goal as a pianist achieved. This is why it is necessary to constantly stop and re-evaluate our goals so that we are aware of what they are, and thus stay motivated.

49. From the passage, if your goals have all been achieved, you should then ______.

A. ask yourself some serious questions    B. take a hard look at your success

C. set some other intelligent goals        D. stretch yourself to relax

50. By saying “life is not a fairy tale”, the author suggests that you should ________ .

A. set as big a goal as possible             B. try hard to realize your dream

C. make your goals practical         D. abandon all your ambitions

51. To perform several Beethoven pieces well is a goal that _______.

A. is not suitable for the pianist         B. is appropriate for a beginner

C. stops you from growing as a pianist   D. is very easy to achieve

52. What is the best title for the passage ?

A. Set Intelligent Goals for Yourself     B. Try to Accomplish Your Goals

C. Get Yourself More Motivated      D. Goals Help You to Succeed

单项选择题