生产费用中应当按照受益原则分配的费用是指（）。 A.直接计入费用 B.固定费用 C.

、下列词语中加点的字读音完全相同的一组是

A．马厩灵柩臼齿一蹴而就

B．拾掇啜泣连缀气息惙然

C．滞留投掷对峙栉风沐雨

D．膨胀涨价徜徉苌弘化碧

Parents who feel disappointed at their teenagers’ failure to pay attention in class, and inability to sit quietly long enough to finish homework or plan ahead, should take solace. Their children are not being lazy or careless, according to new research.

The research has found that teenagers’ brains continue developing far longer into adulthood than we used to think. Teens may look like young adults but their brain structure is similar to that of much younger children.

“It is not always easy for teens to pay attention in class without letting their minds wander, or to ignore distractions from their younger brothers or sisters when trying to solve a maths   problem,” said Dr Iroise Dumon-theil. “But it’s not the fault of teenagers that they can’t pay attention and are easily distracted. It’s to do with the structure of their brains. Teens simply can’t think as well as an adult.”

The research showed that the brain of a teenager works less effectively than that of an adult. “We knew that the front of the brain of teens functioned in a chaotic  (混乱的) way but we  didn’ t realize it continued until the late 20s or early 30s,” said Dr Sarah-Jayne Blakemore, who led the research.

Chaotic thought patterns are a result of teenagers’ brains containing too much grey matter — the cell bodies and connections which carry messages within the brain. As we age, the amount of grey matter in our brain reduces.

“What our research has shown is that there is simply too much going on in the brains of teens,” said Blakemore. “The result is that their brain energy and resources are wasted and their decision-making process is badly influenced. Adults, on the other hand, have less grey matter. This means that the brain works far more effectively.”

小题1:The underlined word “solace” in Paragraph 1 may mean _____.

A． notice

B．medicine

C．comfort

D．action小题2:When making decisions, _____.

A．teens’ brains continue to do much needless work

B．the grey matter in young children’s front brain becomes active

C．people are not likely to be distracted until their late 30s

D．adults are more independent than teens小题3:What is the effect of having too much grey matter?

A．It makes us always feel disappointed.

B．It makes us more intelligent.

C．It had a bad effect on the growth of teens.

D．It had a bad effect on decision-making.小题4:What’s the text mainly about?

A．Teens have different brains from those of children.

B．Adults work more effectively than teens.

C．Grey matter makes teens unable to pay attention.

D．Brain energy is wasted in the brain’s activity.

在应用相对数时以下哪些说法是正确的

A．构成比和率是意义不同的两个指标

B．如果要将两个率合并时，应将两个率直接求平均数

C．计算相对数时，分母的例数不应该太少，例数少时，计算结果的误差较大，此时使用绝对数较好

D．在进行率的比较时，应保证资料的可比性。除对比因素外，其他影响因素应该相同。各组观察对象的内部结构也应该相同

E．率也有抽样误差，需要进一步做统计学分析

更改发票抬头成功审批后，如何继续打印发票？

皮带机司机应做到哪三知：（）。

A、性能

B、结构

C、操作

D、原理