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提高SAT阅读水平的一个必用的方法就是经常找一些SAT阅读素材进行练习，培养语感和阅读速度，不懂的词汇要养成根据上下文的意思进行猜词的习惯，之后再查词典，而不是一开始就查。读的时候不要一个单词一个单词的读，而是按意群来阅读，这样才有助于你SAT阅读水平的提高。 There are many unsolved problems in mathematics. Some prominent outstanding unsolved problems include 1. The Goldbach conjecture. 2. The Riemann hypothesis. 3. The conjecture that there exists a Hadamard matrix for every positive multiple of 4. 4. The twin prime conjecture . 5. Determination of whether NP-problems are actually P-problems. 6. The Collatz problem. 7. Proof that the 196-algorithm does not terminate when applied to the number 196. 8. Proof that 10 is a solitary number. 9. Finding a formula for the probability that two elements chosen at random generate the symmetric group . 10. Solving the happy end problem for arbitrary . 11. Finding an Euler brick whose space diagonal is also an integer. 12. Proving which numbers can be represented as a sum of three or four cubic numbers. | 
