成煤的条件有那些？_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题问答题简答题

成煤的条件有那些？

答案

参考答案：

必须有温湿的气候，便于植物大量的繁殖、衰老、死亡再生长；有能够容纳大量植物遗体的低洼地形，同时有节奏的缓慢下沉，便于植物遗骸不断堆积。

单项选择题 A1/A2型题

浅表皮样囊肿好发于（）

A.头面及背部

B.肘部、臀部

C.手腕

D.足背

E.眉梢或颅骨骨缝

完形填空

Window
Bill and John，both seriously ill，lived in the same room at Marie Hospital．John lived next to the only window of the room and was allowed to 36 in his bed and watch for an hour every day．But Bill had to spend all his time 37 on his back．
They became friends soon and talked for hours every day．They spoke of their families，their children，their hobbies，and their 38 in the American army．Each day John would sit up and 39 to his roommate Bill what he could see outside the window．
Through John’s description，Bill’s world was 40 and brightened by all the activities and colors of the outside world．The window overlooked a beautiful park with a lovely 41 ,John told Bill．Ducks played on the water 42 children sailed their model boats．And a fine view of the city skyline could be seen in the distance．As John described all these 43 ,Bill would close his eyes and 44 the picturesque scene．Bill was recovering 45 . However，John became weak day by day．
Late one night，Bill was lying in bed 46 the ceiling when John began to cough seriously．Then doctors and nurses rushed to the room．Thirty minutes later, John 47 coughing．Now，there was only silence— 48 silence．
The following morning，Bill was moved to the bed next to the window at his request．Slowly and
49 ，he supported himself up on one elbow （胳膊）to take the first look．But to his 50 ，he could see nothing but a 51 wall．
Only at that moment did he begin to realize that the pursuit（追求）of happiness was a matter of 52 ．It was a positive attitude we chose to express．It was not a gift that was 53 to our doorstep each morning，nor did it come through the window．It was all inward journey．Whether a man is happy or not depends on his own thoughts 54 anything outward．
So Bill began to describe the 55 world to his new roommate that he saw through the only window of the room.

A．in addition

B．1ittle by 1ittle

C．sooner or later

A．thinking about

A．regretfully

B．fortunately

C．particularly

A．consideration

B．better than

D．rather than