What has been generally accepted as the reason for adolescence?
A．To allow humans to become sexually mature.
B．To give us an extended childhood during which to learn.
C．To allow us to grow to our relatively large size, compared with other primates.
D．So that parents will take more care of their children.

未分类题The first paragraph intends to______.A．paint a vivid picture of human society 1.5 million years agoB．outline the daily activities teenage humans took part in 1.5 million years agoC．show that teenagers have probably always been insubordinateD．console people who find it hard to communicate with teenagers

未分类题It can be learned from Paragraph 4 that______.A．private oil companies, non-OPEC countries and governments are powerlessB．OPEC needs to increase the refining capacityC．everyone should be more focused on geopoliticsD．OPEC can not be solely responsible for increasing refining capacity

未分类题What happens when a man says something flirtatious to a woman and she laughs?A．The man is being encouraged to continue flirting.B．The woman is discovering that the man is physically attractive.C．The man and woman are playing natural conversational roles.D．The woman is telling the man that she finds him, or his remarks, funny

未分类题Paragraph 2 suggests that______.A．we always laugh with other peopleB．laughter is a form. of communicationC．Robert Provine often laughs more frequently than the average personD．that it is hard to tell yourself a joke

未分类题According to the text, oil prices are kept high because______.A．only a little oil is being refinedB．refineries take a long time to buildC．people are driving too muchD．supplies of refined oil are limited