[简答题]Excessive speed plays a major role in as much as one fifth of all fatal traffic accidents, according to the foundation.

[简答题]Excessive speed plays a major role in as much as one fifth of all fatal traffic accidents, according to the foundation.

[单项选择]

Sleep plays a major role in preparing the body for an alert and productive tomorrow. But sleep is not a period of inactivity. The sleeping brain is highly active at various times during the night, performing numerous "house keeping tasks". These keep us alive and aid our ability to think and remember. Sleep also energizes the body and brain. Most people spend one-third of their lives sleeping and this will affect the other two-thirds in terms of alertness, energy, moods, body weight, perception, memory, thinking, reaction time, productivity and performance.
To limit sleep means our health and daytime potential are significantly reduced. So, good sleep strategies are essential in order to feel energized day after day. There is no strategy which works for everyone, so each person needs to experiment. One important thing is that you shouldn’t worry too much if you go a few nights without a lot of sleep. It won’t ruin your life. On any given night, one i
A. it is a period of complete inactivity for the brain
B. it helps us understand what we have already achieved
C. it makes us more effective when we are awake
D. it helps us to lose weight

[填空题]Sugarless food, such as ______ ,plays a role in the prevention of tooth decay.

[填空题]______play a major role in the development of cancer.

[填空题]Parental involvement plays a limited role in preventing teenage use of drug.

[判断题]A freight forwarder plays an important role in international transport only．( )

[简答题]How physically attractive someone is plays a major role in determining your ideas about the desirability of developing an acquaintance or a friendship with that person. Attractiveness seems to influence our perception of others’ traits. Attractive people are judged to be more poised, sociable, independent, interesting, exciting, and to have greater sexual warmth.
In one study concerned with the importance of physical attractiveness, Karen Dion and her colleagues asked university students to rate a series of photographs of both males and females as high, average, or low in physical attractiveness. The photos were then passed onto another group of students, who were asked to rate those pictures on a number of personality traits and to predict future events in their lives. The results showed that, regardless of whether the rater(评判人) was the same or the opposite sex as the subject, attractive people of both sexes were rated as having more socially desirable personality traits than le