题目内容：

    Clearing the air in class saw significant boosts to reading and math achievement of students, according to a New York University study, even though the outdoor pollution didn’t prove to be a problem. The findings suggest improving air quality may also help disadvantaged students who often live in more polluted areas and attend class in older buildings.

Michael Gilraine, study author at New York University, analyzed both the air quality and the math and reading test scores at the 18 schools. In schools that received the new air filters, students improved by 0.18 of a standard deviation(标准偏差) in reading and 0.2 of a standard deviation in math, compared to students’ performance in the schools that did not receive air filters. To put that in perspective, those gains are about equal to the learning benefits from reducing class sizes or providing intensive tutoring. Students sustained those math and reading gains the next year, particularly if they attended the same school or another that had installed new filters in the following year. “In fact, given the large test-score increases they generate, installing air filters actually outperforms other education reforms such as class-size reduction on a cost-benefit basis,” Gilraine said.

Prior studies have found that better air quality can lead to fewer teacher and student absences, particularly for those with chronic asthma (慢性哮喘) or other respiratory illnesses. While schools with the new air filters installed did have lower student absenteeism, attendance alone didn’t seem to be driving the gains in math and reading achievement. Rather, he said, “you can get a lot just from being able to think clearly while you take a test. And then you also might be learning a bit better because you’re thinking clearer in class from day to day”.

Separate studies have found rising average temperatures likewise can increase indoor air pollution and reduce student achievement, particularly if students take tests on hot days.

“We’ve had a decade or more of research into the effects of lead. There’s been much less research on the effects of air quality We’re still in early days.” added Gilraine.

1.What did the study find?

A.Outdoor pollution does harm to students’ health.

B.Clean air promotes the students’ study achievement.

C.Air quality puts New York University at a disadvantage.

D.Polluted areas and old buildings have air problems.

2.How did the researcher conduct his study?

A.By making analysis and comparison.

B.By giving examples and listing basic data.

C.By telling stories and doing experiments.

D.By demonstrating the causes and effects.

3.According to Gilraine, what makes the students gain achievement?

A.Fewer teacher and student absences.

B.Rising temperatures in class.

C.Clearer thinking in better air quality.

D.Taking a math and reading test everyday.

4.What can we infer about the Gilraine’s research?

A.It will focus on the research of lead. B.It gets off with a good start.

C.It gets lots of support from schools. D.It still has a long way to go.