根据皮亚杰的认知发展理论，在对称关系中已知A=B、B=C，小学儿童就能推论出A=C的

阅读短文，根据其内容回答问题。

Phys ed (physical education) is making a comeback, but with a difference. The new way is to teach skills that are useful beyond gym class, like lifting weights, balancing their diets and building physical endurance（耐力）.

Considering that 15% of American children 6 to 18 are overweight, supporters say more money and thought must be put into phys ed curriculum. In many cases, that may mean not just replacing the old gym-class model with fitness programs but also starting up phys ed programs because school boards（教育委员会）often “cut P.E. completely or decrease（减少）its teachers or the days it is offered,” says Alicia Moag-Stahlberg, the director of Action for Health Kids. The difference in phys ed programs is its short of a national standard.

The wisdom of the new idea has some scientific support. Researchers at the University of Wisconsin have showed how successful the fit-for-life model of gym class can be. They observed how 50 overweight children lost more weight when they cycled and skied cross-country than when they played sports. The researchers have also found that teaching group sports like football results in less overall（全体的）movement, partly because the students who are unwilling to do may sit on the bench.

Another problem with simply teaching group sports in gym class is that only a small part of students continue playing them after finishing their high school. The new method teaches skills that translate to adulthood, which means kids are given skills and experiences so they can lead a physically active life in their future.

小题1:Is the new Phys ed program different from the one before?

小题2:What does the new P.E. program teach the students?

小题3:According to the passage, what do some school boards do with P.E?

小题4:What are the problems with simply teaching group sports?

小题5:What’s the passage mainly about?

生物多样性不包括

A．物种多样性

B．环境多样性

C．遗传多样性

D．生态系统多样性

由于溶菌酶的作用，刚挤出的奶中微生物的数量不会增多，而是逐渐减少。( )

电力机车压缩机曲轴颈与轴瓦间隙为（）时禁用。

A.0.1mm

B.0.15mm

C.0.20nun

D.0.25mm