Parents who help their children with homework may actually be bringing down their school grades. Other forms of prenatal involvement, including volunteering at school and observing a child's class, also fail to help, according to the most recent study on the topic.
The findings challenge a key principle of modern parenting(养育子女) where schools except them to act as partners in their children's education. Previous generations concentrated on getting children to 
school on time, fed, dressed and ready to learn.
       Kaith Robinson, the author of the study, said, "I really don't know if the public is ready for this but there are some ways parents can be 
involved in their kids' education that leads to declines in their academic performance. One of the things that was consistently negative was
 parents' help with homework." Robinson suggested that may be because parents themselves struggle to understand the task." They may 
either not remember the material their kids are studying now, or in some cases never learnt it themselves, but they're still offering advice."
       Robinson assessed parental involvement performance and found one of the most damaging things a parent could do was to punish their children for poor marks. In general, about 20% of parental involvement was positive, about 45% negative and the rest statistically
 insignificant.
      Common sense suggests it was a good thing for parents to get involved because "children with good academic success do have involved
 parents ", admitted Robinson. But he argued that this did not prove parental involvement was the root cause of that success." A big 
surprise was that Asian-American parents whose kids are doing so well in school hardly involved. They took a more reasonable approach, conveying to their children how success at school could improve their lives."

阅读下面的四篇短文，根据短文内容，从短文后各题所给的A、B、C、D四个选项中，选择最佳选项。

    For centuries, the body's blood has been connected closely with the feelings. People who show no human emotions or feelings are said to be cold-blooded.

Cold can affect other parts of the body. But the expression ―get cold feet has nothing to do with cold or your feet. The expression means being afraid to do something you have decided to do. For example, you agree to be CEO of a company. But then you learn that all the other officers have resigned (辞职), and all the work of the company will be your responsibility (责任). You are likely to get cold feet about being CEO when you understand the situation.

    The expression “give someone the cold shoulder” probably comes from the physical act of turning your back toward someone, instead of speaking to him face to face. You may give the cold shoulder to a friend who has not kept a promise (遵守诺言) he made to you, or to someone who has lied about you to others.

    “A cold fish” is not a fish. It is a person. But it is a person who is unfriendly, unemotional and shows no love or warmth. A cold fish does not offer much of himself to anyone. Someone who is a cold fish could be cold-hearted. He or she will never feel sorry for those in bad situation.

    “Out in the cold” means not getting something that everybody else got. A person might say that everybody but him got a pay raise—he was left out in the cold. And it is not a pleasant place to be.