A、Foolish people. B、Smart people. C、Talkative people. D、Forgetful people. B

A study in the Electronic Journal of Research In Educational Psychology found that students who worked out math problems out loud got more accurate results, and faster. Did you ever sit down to take a test and discover that the person next to you mumbles his way through the whole thing?(19)You probably thought, "What kind of fools can’t add a few numbers without moving his mouth?" It turns out the answer may be: a very clever fool.
    Because a study published in the Electronic Journal of Research In Educational Psychology suggests that students who think out loud while taking a math test are more likely to get the right answer. Counting things out on fingers is a long tradition. But this study looked at what happens when students bring their lips in on the action. A handful of mathematics students were showed into separate rooms and given some problems to solve. The researchers videotaped their efforts and graded their exams.(20)And they found that the students who reasoned through their thinking out loud, or who drew out pictures that represented the problem, were able to answer the questions more quickly— and more accurately—than students who were quiet and didn’t draw the sketches.
    How these sketches and self-talks can help with your calculations remains a statement waiting for a proof.(21)Until then, remember: sound it out; show your work; and when you run out of fingers, you can always count on your toes.