新
新SAT数学练习题目1：
Read the following SAT test question and thenclick on a button to select your answer.
In 2004, the number of people aged 16 years orolder in the United States was approximately223357000. According to the Bureau of Labor Statistics, at that time 66% of the populationaged 16 and older was employed, and women made up about 46.4% of this category.Approximately how many women aged 16 and older were employed in 2004?
A.68400000
B.104000000
C.147400000
D.157000000
重点单词讲解：
multiple ['mʌltipl]
adj. 许多，多种多样的
calculate ['kælkjuleit] v. 计算，估计，核算，计划，认为
population [.pɔpju'leiʃən] n. 人口 ，(全体)居民，人数
approximately [ə'prɔksimitli] adv. 近似地，大约
category ['kætigəri] n. 种类，类别
新SAT数学练习题目2：
Read the following SAT test question and thenclick on a button to select your answer.
ax+5=4x-3
In the linear equation shown above, a is aconstant. If the equation has no solution, what is the value of a?
A.1
B.2
C.3
D.4
重点单词讲解：
solution [sə'lu:ʃən] n. 解答，解决办法，溶解，溶液
variable ['vɛəriəbl] adj. 可变的，易变的
multiple ['mʌltipl] adj. 许多，多种多样的
equation [i'kweiʃən] n. 相等，方程(式), 等式，均衡
constant ['kɔnstənt] adj. 经常的，不变的
答案：D
解析：
Choice D is correct. A linear equation in onevariable will have no solution if the equationreduces to an equation of the form:
ax+b=cx+d, where a=c and b≠d.
Therefore, if a=4, the equation 4x+5=4x-3 yields 5=-3. This is not true for any values of x,and therefore this value of a results in an equation with no solutions.