问题 填空题

据《中国经济周刊》报道,上海世博会第四轮环保活动投资总金额高达821亿元,其中821亿用科学    记数法表示为(    ),保留两位有效数字为(    )。

答案

8.21×1010;8.2×1010

单项选择题
阅读理解

阅读理解。

      People with less education suffer fewer stressful days, according to a report in the current issue of the

Journal of Health and Social Behavior.

      However, the study also found that when less-educated people did suffer stress it was more severe and

had a stronger effect on their health.

      From this, researchers have concluded that the day-to-day factors that cause stress are regular. Where

you are in society determines the kinds of problems that you have each day, and how well you will cope with

them.

      The research team interviewed a national sample of 1, 031 adults daily for eight days about their stress

level and health. People without a high school diploma reported stress on 30 percent of the study days, people

with a high school degree reported stress 38 percent of the time, and people with college degrees reported

stress 44 percent of the time.

     "Less advantaged people are less healthy on a daily basis and are more likely to have downward turns in

their health." leading researcher, Dr. Joseph Grzywacz of Wake Forest University Baptist Medical Center,

said in a prepared statement."The downward turns in health were connected with daily stressors (紧张刺激物),

and the effect of daily stressors on their health is much more damaging for the less advantaged."

      "If something happens every day, maybe it's not seen as a stressor." Grzywacz says. "Maybe it is just life."

1. Stress level is closely related to ______. [ ]

A. family size

B. social position

C. body weight

D. work experience

2. Which group reported the biggest number of stressful days? [ ]

A. People without any education.

B. People without high school degrees.

C. People with high school degrees.

D. People with college degrees.

3. The less advantaged people are, the greater ______. [ ]

A. the effect of stress on their health is

B. the effect of education on their health is

C. the level of their education is

D. the degree of their health concern is

4. Less-educated people report fewer days of stress possibly because ______. [ ]

A. they don't want to tell truth

B. they don't want to face the truth

C. stress is too common a factor in their life

D. their stress is much greater