由于矿石初选工况较为恶劣，因此在这一工段，渣浆泵的使用寿命普遍（）。

关于熊某的刑事责任，下列说法正确的是

A．熊某构成保险诈骗罪的共犯

B．熊某不构成保险诈骗罪的共犯

C．熊某构成故意伤害罪，因为其故意造成任某重伤

D．熊某不构成故意伤害罪，因为是被害人任某同意的行为

     Each new school year brings fresh reminders of what educators call the summer learning gap．Some call it the summer learning setback Put simply, it means the longer kids are out of school，the more they forget．The only thing they might gain is weight．

Most American schools follow a tradltional nine-month calendar with winter and spring breaks and about ten weeks of summer vacation．Some schools follow a year-round calendar. They hold classes ror about eight weeks at a time，with a few weeks off in between．The National Association for Year-Round Education says there were fewer than 3,000 such schools at last count．They were spread among forty-six of the tifty states．

But many experts point out that the number of class days in a year-round school is generally the same as in a traditional school．Brenda McLaugblin is research director at the National Center for Summer Learning at Johns Hopkins University．She says studies of year-round schooling have not found strong learning gains．Lead researcher Paul von Hippel said，“Year-round schools don’t really solve the problem of the summer learning setback．They simply spread it out across the year．”

Across the country, research shows that students from poor families fall farther behind over the summler than other students．Experts say this can be prevented．They note that many schools and local governments offer programs that can help．

But calling them“summer school”could be a problem．The director of the summer learning center at Johns Hopkins, Ron Fairchild, said research with groups of different parents in Chicago and Baltimore found that almost all strongly disliked the term“summer school”．In American culture，the idea of summer vacation is connected to beliefs about freedom and the joys of childhood．The parents welcomed other terms like“summer camp。”“extra time”and“hands-on learning．”

小题1:According to the first paragraph，the summer learning gap     

A．helps children to gain weight

B．leads children to work harder

C．improves children’s memories

D．affects children’s regular studies小题2:Compared to traditional schools，students in the year-round ones     ．

A．perform better and have more learning gains

B．have much less time for relaxation every year

C．have generally the same number of class days

D．hold more classes with more free weeks off小题3:Which of the following statements is true?

A．Students from poor families often fall behind after the vacation．

B．Year-round schools can solve the problem of the learning gap

C．There are schools in each state following a year-round calendar

D．Nothing can help the students who fall behind after the vacation．小题4:Why did almost all parents dislike the term“summer school”?

A．They are worried about the quailty of the“summer school”

B．They cherish the children’s rights of freedom very much．

C．They want their children to be forced to make up the gap．

D．They can’t afford to the further study during the vacation．小题5:What would be the best title of this passage?

A．Opening Summer Camps

B．Forbidding Summer Schools

C．Minding the Summer Learning Gap

D．Reforming Year-Round Education

公共浴室、旅馆及有热水供应系统的公共卫生间等生活废水排水管系统应选用（）耐高温排水管材。

A、高密度聚乙烯排水管

B、氯化聚氯乙烯管

C、聚丙烯排水管

D、聚丙烯复合管

材料一：16世纪末出现了中国一菲律宾一美洲的大帆船贸易。学者严中平认为；“中国纺织品还经过马尼拉销售到西属美洲殖民地去，早在16世纪末叶，中国棉布已经在墨西哥市场上排挤了西班牙货。有的文献说，因为中国棉布价廉物美，所以印第人和黑人都用中国货而不用欧洲货。“中国丝绸就更为畅销了，”他还说，“实际上，中国对西班牙殖民帝国的贸易关系，就是中国丝绸流向菲律宾和美洲，白银流向中国的关系。”

材料二：金本位制就是以黄金为本位币的货币制度。在金本位制下，每单位的货币价值等同于若干重量的黄金（即货币含金量）；当不同国家使用金本位时，国家之间的汇率由它们各自货币的含金量之比——铸币平价来决定。金本位制于19世纪中期开始盛行。以下是各国使用金本位的时间。

材料三1971年8月15日，尼克松政府宣布实行“新经济政策”，停止履行外国政府和中央银行可用美元向美国兑换黄金的义务。12月，美国拒绝向国外中央银行出售黄金。

根据材料一并结合所学知识，指出大帆船贸易出现的原因。