3．A。细节理解题。根据第四段中的“Other critics question whether the bill can be enforced and say that it may even violate an international treaty.”可知，A项正确。

　　4．D。推理判断题。从文章的最后一句话可知，登月遗址使美国人感到骄傲并且能够激励未来的人。

　　阅读

　　Becoming aware of the warning signs of learning disabilities and getting children the necessary help early on can be key to a child’s future.

　　Learning disabilities affect one in seven people according to the National Institutes of Health. Parents, therefore, need to be familiar with the early indicators of a learning disability in order to get the right help as soon as possible.

　　The earlier a learning disability is detected, the better chance a child will have of succeeding in school and in life. Parents are encouraged to understand the warning signs of a learning disability from as early as pre-school. The first years in school are especially crucial for a young child.

　　The most common learning disability is difficulty with language and reading. A recent National Institutes of Health study showed that 67 percent of young students identified as being at risk for reading difficulties were able to achieve average or above average reading ability when they received help early.

　　Many children and adults with learning disabilities remain undiagnosed and go through life with this “hidden handicap (障碍)”.

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