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【单选题】
在猫中（B）控制黑色性状，（b）控制黄色性状，Bb则表现为虎斑色，B和b基因都位于X染色体上，现有一只虎斑色雌猫与一只黄色雄猫交配，产生的可能有A.
黑色雌猫和黄色雄猫
B.
黄色雌猫和黑色雄猫
C.
黄色雌猫和虎斑色雄猫
D.
黑色雌猫和虎斑色雄猫
E.
黑色雌猫和黄色雌猫
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【简答题】Which cost in raising children has increased the most?
【简答题】However, most children are 2 ( face ) with a completely different situation. Most parents fear that s will pr children from increasing new knowledge and 3 the children will fail in ...
【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 to approach a snake, were given praise when they tried, and watched one 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 touched the snake).
D.
The 'verbal input only' received only verbal assurances from the .
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.
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