Monkeys seem to have a way with numbers.
A team of researchers trained three Rhesus monkeys to associate 26 clearly different symbols consisting of numbers and selective letters with 0-25 drops of water or juice as a reward. The researchers then tested how the monkeys combined — or added — the symbols to get the reward.
Here’s how Harvard Medical School scientist Margaret Livingstone, who led the team, described the experiment: In their cages the monkeys were provided with touch screens. On one part of the screen, a symbol would appear, and on the other side two symbols inside a circle were shown. For example, the number 7 would flash on one side of the screen and the other end would have 9 and 8. If the monkeys touched the left side of the screen they would be rewarded with seven drops of water or juice; if they went for the circle, they would be rewarded with the sum of the numbers — 17 in this example.
After running hundreds of tests, the researchers noted that the monkeys would go for the higher values more than half the time, indicating that they were performing a calculation, not just memorizing the value of each combination.
When the team examined the results of the experiment more closely, they noticed that the monkeys tended to underestimate (低估) a sum compared with a single symbol when the two were close in value — sometimes choosing, for example, a 13 over the sum of 8 and 6. The underestimation was systematic: When adding two numbers, the monkeys always paid attention to the larger of the two, and then added only a fraction (小部分) of the smaller number to it.
“This indicates that there is a certain way quantity is represented in their brains,” Dr. Livingstone says. “But in this experiment what they’re doing is paying more attention to the big number than the little one.”

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1.What did the researchers do to the monkeys before testing them?

A They fed them.

B They named them.

C They trained them.

D They measured them.

解析：选C。细节理解题。根据第二段第一句A team of researchers trained three Rhesus monkeys to associate 26 clearly different symbols…with 0-25 drops of water or juice as a reward.可知，实验开始前，研究人员先对猴子进行训练，故选C。

2.How did the monkeys get their reward in the experiment?

A By drawing a circle.

B By touching a screen.

C By watching videos.

D By mixing two drinks.

解析：选B。细节理解题。根据第三段第四句If the monkeys touched the left side of the screen they would be rewarded with seven drops of water or juice可知，猴子通过触摸屏幕得到奖励，故选B。

3.What did Livingstone’s team find about the monkeys?

A They could perform basic addition.

B They could understand simple words.

C They could memorize numbers easily.

D They could hold their attention for long.

解析：选A。推理判断题。根据第四段the researchers noted that the monkeys would go for the higher values more than half the time, indicating that they were performing a calculation, not just memorizing the value of each combination可知，研究人员注意到猴子超过一半的时间都会去触摸更高的数值，表明它们在进行计算，而不仅仅是记住每个组合的值，由此可推知，猴子会进行简单的加法计算，故选A。

4.In which section of a newspaper may this text appear?

A Entertainment.

B Health.

C Education.

D Science.

解析：选D。推理判断题。本文主要介绍了科学家们对恒河猴进行的有关数字计算的科学实验，应出现在报纸的科学专栏中，故选D。