当代小说家冯骥才创作的描写辫子神功的一部小说是（）。

现有 ①液态氧  ②空气   ③食盐水  ④小苏打  ⑤干冰  ⑥碘酒  ⑦水银 。对上述物质的分类全部正确的是

A．纯净物—①④⑤⑦

B．混合物—②③④⑥

C．氧化物—①⑤

D．金属单质—①⑦

Going to school from 8 am until 5 pm may sound terrible，but Sydney Shaw，a seventh grader at the Alain Locke Charter Academy on Chicago's West Side，has come to like it—as well as the extra 20 or so days that she's in class every year．“I'm sure every kid at this school says bad things about the schedule sometimes，”says Sydney, who was at school on Columbus Day, when most Chicago schools had a holiday．“But we all know it's for our benefit.”

Finding ways to give kids more classroom time，through longer hours，a longer school year，or both，is getting more attention．“If you want to look at schools where the achievement gap is narrowing, they're saying they couldn't do it without the added time，”says Jennifer Davis．“Even when you get good teachers into schools，you also need more time．”

According to studies, low-income students fall back more than two months in their reading skills over summer vacations．“It's over the summer months that poor kids fall behind，”says Karl Alexander，a sociologist．“If you have parents who themselves didn't succeed at school and aren't highly educated，kids aren't going to get those skills at home．”

Schools are asked to take a full year to plan how to best use the extra time—a process involving teachers，principals，students and parents．They are given outside support to help them base their plans on the best available analyses of student needs．It's still early，but officials are already seeing stronger test scores and a narrowing achievement gap．

But some critics are worried．“We risk producing something that's very expensive and time-consuming, and that will give educators a lot of trouble，”says Frederick Hess．“Before we spend all that extra money，I'd much rather see if we can figure out how to get 50 percent more instructional time out of the current school day．”

小题1:From the first paragraph，we learn that      ．

A．the longer schedule is harmful to kid's health

B．all Chicago students had a holiday on Columbus Day

C．Sydney Shaw supports the added time

D．few kids are bored with the lack of holidays小题2:Low-income students fall behind in summer because      ．

A．no good teachers are willing to teach them

B．they can't get help from their parents

C．their parents are unwilling to hire private teachers

D．they themselves have no desire to learn小题3:Some people are worried about adding school hours mainly because      ．

A．it will have a bad effect on the kids’ futures

B．the current school day has been too busy

C．no one supports the idea

D．it will be costly and time-consuming小题4:The text is mainly about      ．

A．whether a longer school day will help narrow the achievement gap

B．how students have benefited from additional school hours

C．why the achievement gap among students needs to be narrowed

D．what causes the achievement gap among students

（）your latest tropical storm warning information?

A.What is

B.How is

C.What are

D.How are

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