4. Which of the following statements is INCORRECT？
A.A language is a means of expressing a particular culture.
B.All languages can well express their respective cultures.
C.American Indian languages are as sophisticated as English.
D.Some languages are better than other languages.
5. According to the author， language changes are most likely to occur in
A.grammar.
B.pronunciation.
C.vocabulary.
D.intonation.
Stress Level Tied to Education LevelPeople 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 1ess-educated people did suffer stress it was more severe and had a larger impact on their health.
From this.researchers have concluded that the day-to-day factors that cause stress are not random.Ⅵr11ere 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 1.03 1 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.”lead 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.and the effect of daily stressors on their health is much more devastating for the less advantaged.”
Grzywacz suggested follow-up research to determine why less-educated people report fewer days of stress when it is known their stress is more acute and chronic.
“If something happens every day， maybe it’snot seen as a stressor”Grzywacz says.“Maybe it is just 1ife.”
词汇：
stressful adj.紧张的；压力重的
diploma n.毕业文凭，毕业证书
stressor n.紧张刺激物
devastating adj.毁灭性的
follow-up n.(对病人的)随访