remarkable part of that study was not that the kids improved and earned higher grades; it was that Dweck noted that a few of the tough boys in the group were brought to tears, learning that the level of intelligence they could reach was limitless - it was entirely up to them.

　　Of course, not all of us will become genius mathematicians, but the majority of us can become skilled and maybe even good at math. As Mashable points out, while dyscalculia (计算障碍), a math disability, is a real thing, only 6 percent of the population is likely to have it. For the rest of us, it's a confidence problem, or a lack of belief that with hard work, we'll improve. Thankfully, we now know better, and we can pass on that_information to the next generation.

4．Many people don't work hard at math because they think that ________.

A．their intelligence is high B．math is not worth learning

C．it's useless to put in the effort D．they have understood the material

5．According to Miles Kimball and Noah Smith, ________.

A．math is a big problem to deal with

B．most Americans don't like math at all

C．math is an important subject at school

D．one can learn anything as long as he works hard

6．In Carol Dweck's study, the students ________.

A．passed the tests easily B．became good at math soon

C．didn't get higher grades in the test

D．know their intelligence depends on themselves

7．What does the underlined part "that information" refer to?

A．Math disability doesn't really exist.

B．Everyone is likely to learn math well.

C．Math cannot be ignored at any time.

D．Confidence is important in one's life.

　　C

When she was studying to become a scientist, Megan Strauss rode in a small airplane to study giraffes. While a pilot flew over the Serengeti in Tanzania, Africa, the researchers looked down carefully and counted giraffes. "I am always