独家：教师谈2016年SAT数学考试改革篇（一）

SAT多年来在考试内容固化的批评之下，外加ACT的分庭抗争，高高在上的SAT终于要在2016年走下神坛，回归人间(美利坚)，数学部分也不例外地走向实用迈了一大步。

首先，是题量和时间。题目总数只增加了3题，但额外多出了10分钟。这意味考生每题拥有更多的思考和计算时间，从原先平均每题的77秒增加到了 84秒。不错的消息!

此外，这58题中有20题不能使用计算机，只有25分钟的答题时间。每题75秒。这似乎对于头脑灵活的中国学生来说不会成为什么负担。

但是，请尝试在75秒内完成下题：

Aresearcher places two colonies of bacteria into two petri dishes that each havearea 10 square centimeters. After the initial placement of the bacteria (t=0),the researcher measures and records the area covered by the bacteria in eachdish every ten minutes. The data for each dish were it by a smooth curve, asshown above, where each curve represents the area of a dish covered by bacteriaas a function of time, in hours. Which of the following is a correct statementabout the data above?

A)At time t = 0, both dishes are 100% covered by bacteria.

B)At time t = 0, bacteria covers 10% of Dish 1 and 20% of Dish 2.

C)At time t = 0, Dish 2 is covered with 50% more bacteria than Dish 1.

D)For the first hour, the area covered in Dish 2 is increasing at a higher averagerate than the area covered in Dish 1.

你在时间内完成了吗?这道题目本身是一道典型结合实际的图表题。学生完全可能在今后的课堂中遇到这样的案例分析。CollegeBoard无疑将会加大该题型在数学考试中的比重。

题目内容是：一个研究者把两组细菌放入两个有盖培养皿中,每个培养皿面积为10平方厘米。从初始细菌放置(t = 0)起,研究者会每隔十分钟测量和记录每个培养皿中被细菌所覆盖的区域面积。从每个培养皿所得的数据如上图所示的平滑曲线。图中每个曲线表示该培养皿中被细菌所覆盖的区域面积以小时为单位的时间函数。那么，以下哪一个正确表述了上面的数据呢?

更多2016年SAT考试改革动态变化及考试样题，>>在线免费咨询获得老师1对1答疑

A)在时间t = 0时，2个培养皿都100%被细菌覆盖。

B)在时间t = 0时，细菌覆盖10%的培养皿1和20%的培养皿2。

C)在时间t = 0时，培养皿2比培养皿1多覆盖了50%的细菌。

D)在第一个小时， 培养皿2中的被覆盖面积比培养皿1中的被覆盖面积增加的更快。

毫无疑问这题的答案是B。如果看中文解题，除了文字有些绕，相信大多数的同学都不会被题目的本身所难道。但是在全英语的条件下做题，那又是另一个故事了。我们只有75秒。

我们再来看一道官方样题：

Aninternational bank issues its Traveler credit cards worldwide. When a customermakes a purchase using a Traveler card in a currency different from thecustomer’s home currency, the bank converts the purchase price at the dailyforeign exchange rate and then charges a 4% fee on the converted cost.

Saralives in the United States, but is on vacation in India. She used her Travelercard for a purchase that cost 602 rupees (Indian currency). The bank posted acharge of $9.88 to her account that included the 4% fee.

PART 1

Whatforeign exchange rate, in Indian rupees per one U.S. dollar, did the bank usefor Sara’s charge? Round your answer to the nearest whole number.

PART 2

Abank in India sells a prepaid credit card worth 7,500 rupees. Sara can buy theprepaid card using dollars at the daily exchange rate with no fee, but she willlose any money let unspent on the prepaid card. What is the least number of the7,500 rupees on the prepaid card Sara must spend for the prepaid card to becheaper than charging all her purchases on the Traveler card? Round your answerto the nearest whole number of rup fees.

W(我)Q(去)!这就是传说中的WordQuestions(文字题)。而且这不是我们常见的选择题(可以用代入法高效解题)，而是需要考生计算出答案后，手动填入答题纸。到这里相信大家应该明白。

总之，对于美国学生来说，新增不用计算器解2次方程等或许会是一个问题-我们无需对题目的难度过于担心;而对于中国学生而言，能否在时间内有效地理解我们不太接触的图表和大量文字抑或成为取得高分的一大障碍。

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