题目内容：

Parents who help their children with homework may actually be bringing down their school grades. Other forms of parental 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 where schools expect 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.

Keith 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 their parents' help with homework." Robinson suggested that may be because parents themselves struggle to understand the tasks."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."

1.The underlined expression "parental involvement" in paragraph 1 probably means _______.

A. parents' participation in children's education

B. parents' expectation on children's health

C. Parents' plan for children's future

D. parents' control over children's life

2.What is the major finding of Robinson's study?

A. Parents are not able to help with children's homework.

B. Parental involvement is not so beneficial as expected.

C. Punishing kids for bad marks is mentally damaging.

D. Modern parents raise children in a more scientific way.

3.The example of Asian-American parents implies that parents should _______.

A. help children realize the importance of schooling

B. take a more active part in school management

C. set a specific life goal for their children

D. spend more time improving their own lives