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【单选题】
设 是公差为 （ ）的无穷等差数列 的前 ，则下列命题错误的是（ ）A.
若 ，则数列 有最大项
B.
若数列 有最大项，则
C.
若数列 是递增数列，则对于任意的 ，均有
D.
若对于任意的 ，均有 ，则数列 是递增数列
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【简答题】Which cost in raising children has increased the most?
【单选题】Children's fears come and go, but most children experience similar types of fears at approximately the same age. For toddlers, the worst fears are often associated with separation and change. Toddlers...
A.
Members of the 'contact desensitization group' were told about snakes and how to approach them, were encouraged by an adult to approach a snake, were given praise when they tried, and watched one adult hold the snake.
B.
The 'contact desensitization without touch group' received all that group A did, but no one touched the snake.
C.
The 'verbal input plus modeling group' received verbal input and modeling (when the adult touched the snake).
D.
The 'verbal input only' received only verbal assurances from the adult.
E.
Finally, one group of children received no treatment and, hence, was called the 'no treatment group.' The researchers used something called the Behavior. Avoidance Test to see if there was a reduction in avoidance of the snake. The results showed that 82 percent of the children in the contact desensitization group reduced their fear of snakes. Children in the other groups also reduced their fear, but not as dramatically. Fears are something we all have to live with. When they get out of hand, a technique like the one we described here can be very useful in assisting a child through a difficult experience. What is the meaning of the word 'index' as it is used in P A．An indicator or measurement of something. B．A list or catalog of information. C．An object used to point or indicate. D．A relation or ratio of one quantity to another.