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举一反三
【单选题】不管成交与否，当顾客稍有疑问时，推销员便以对方当然会购买的说法迫使顾客交易。这种交易成交方法叫（）。
A.
假定成交法
B.
保证成交法
C.
选择成交法
D.
最后成交法
【单选题】若三棱锥的一条棱长为 ，其余棱长均为1，体积是 ，则函数 在其定义域上为（ ）
A.
增函数且有最大值
B.
增函数且没有最大值
C.
不是增函数且有最大值
D.
不是增函数且没有最大值
【单选题】>关于氧气顶吹转炉中的碳氧反应，下列叙述中哪一条是正确的：( )。
A.
冶炼初、中、后期的脱碳速度是快-快-慢
B.
冶炼初期脱碳速度几乎是随着冶炼时间直线增加
C.
冶炼中期脱碳速度不仅仅取决于供氧强度
D.
冶炼中期脱碳速度大幅提升
【多选题】根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。(71 )When a person does a certain thing again, he is impelled(迫使) by some unseen force to do the same thing repeatedly; thus a habit is formed．Once a habit is ...
A.
There are other habits which, when formed in early life, are of great help.
B.
Whether good or not habits are, they are easy to get rid of.
C.
We ought to keep from all these bad habits, and try to form such habits as will prove good for ourselves and others.
D.
Habits, whether good or bad, are gradually formed.
E.
It is very important for us to know why we should get used to good habits.
F.
These are all easily formed habits.
G.
It is therefore very important that we should pay great attention to the formation of habits.