题干

下面是某同学在测肺活量时,记下的三次数值,分别是:3200mL、3500mL、3800mL,则该同学的肺活量应为(    )

A:3200 mL

B:3500 mL

C:3800 mL

D:10500 mL

上一题 下一题 0.0难度 选择题 更新时间:2018-03-20 10:07:56

答案(点此获取答案解析)

C

同类题2

阅读理解

    We want our children to succeed, in school and, perhaps even more importantly, in life. But the paradox(悖论) is that our children can only truly succeed if they first learn how to fail. Consider the finding that world-class figure skaters fall over more often in practice than low-level figure skaters. At first sight this seems contradictory. Why are the really good skaters falling over the most?

    The reason is actually quite simple. Top skaters are constantly challenging themselves in practice, attempting jumps that stretch their limitations. This is why they fall over so often, but it is precisely why they learn so fast. Lower-level skaters have a quite different approach. They are always attempting jumps they can already do very easily, remaining within their comfort zone. This is why they don't fall over. In a superficial sense, they look successful, because they are always on their feet. The truth, however, is that by never failing, they never progress.

    What is true of skating is also true of life. James Dyson worked through 5,126 failed prototypes(原型) for his dual cyclone vacuum before coining up with the design that made his fortune. These failures were essential to the pathway of learning. As Dyson put it: “You can't develop new technology unless you test new ideas and learn when things go wrong. Failure is essential to invention.”

    In healthcare, however, things are very different. Clinicians don't like to admit to failure, partly because they have healthy egos(自我)(particularly the senior doctors) and partly because they fear litigation(诉讼). The consequence is that instead of learning from failure, healthcare often covers up failure. The direct consequence is that the same mistakes are repeated. According to the Journal of Patient Safety, 400,000 people die every year in American hospitals alone due to preventable error. Until healthcare learns to respond positively to failure, things will not improve.

    But let us return to children. One of the major mistakes in education in the 1970s was the attempt to equip children with confidence by giving them lots of successes (setting the bar very low). The consequence was that the ego of kids became bound up with success, and they became unable to take risks and collapsed as soon as they hit a proper challenge.

    We need to flip(翻转) this approach. In a complex world, failure is inevitable. It is those individuals and institutions that have the flexibility to face up to failure, learn the lessons and adapt which eventually excel(突出).

同类题3

阅读理解。

    Long, long ago there were a lot of donkeys. The donkeys worked hard every day. They had no time to play or to relax, but they never felt appreciated(赏识)for the work they did.

    One day two donkeys got bored. They wanted to live a comfortable life, so the donkeys went to see a wise old man. They told him their problem. The wise old man agreed that they worked too hard, and he wanted to help the donkeys. “I have an idea,” he said.

    “What is your idea?” asked the donkeys.

    “I will paint you and no one will know you are donkeys,” said the man.

    The man went off to find some paint and he returned in just a few minutes. He had two pots of paints. One pot was filled with white paint, and the other black paint.

    The old man first painted them white, and then painted black stripes over the white paint. When he finished, the donkeys did not look like donkeys at all. “You no longer look like donkeys,” the old man said. “Everyone will be fooled. I will call you something else, Zebras.”

    The zebras went to a field to eat grass. Now they did not have to work.

    Soon, other donkeys saw the zebras. They asked the zebras where they came from. When the zebras told the donkeys their secret, the donkeys all rushed to see the old man.

    “Please make us into zebras, too.” They pleaded. So the wise old man painted more donkeys. As he did, more and more donkeys came.

    The old man could not paint fast enough. Soon the donkeys became impatient. They began to kick about, and they knocked over the paint pots.

    There was no more paint. The painted donkeys ran off to become zebras. The unpainted donkeys, because of their impatience, had to return to work.