Girls really prefer pink and boys prefer blue, recent research shows. The reasons could have its origins in the hunt for food on the African savannah thousands of years ago. Evolution may have developed women's preference for pink, perhaps because it helped to find ripe fruit and healthy men with reddish faces, while both men and women have a natural desire for blue, according to scientists at prefix = st1 /NewcastleUniversity. " Everyone in today's western culture, from parents to toy manufactures, seems to assume that little girls like pink." Said Prof. Anya Hulbert, who wanted to find out whether the reason was cultural or to do with biology. A love of salmon, _ and coral does seem to be rooted into females, rather than picked up from their mothers. The participants in the study were Chinese and British. The Chinese students showed a marked preference for red, " Culture may contribute to this natural female preference," said Pro. Hulbert. In her experience, 208 young adult men and women were asked to select, as rapidly as possible, their preferred color1. Hulbert and her colleague Dr. Yazhu Ling marked the results and found that while men preferred blue, women tended to choose pink. Hulbert said she could only prefer about the preference for blue: " Here again, I would favor evolutionary arguments. Going back to our savannah days, we would have a natural preference for a clear blue sky, because it signaled good weather. Clear blue also signals a good water source." By saying " the Chinese students for red." In Para. 5, the writer means _ . A) red is the Chinese students' favorite color1 B) the Chinese prefer red more than the British C) culture influences people's color1 preferences D) the study was carried out by two nations
C
Many people say they can not start their day without first having a cup of coffee or tea.People say these drinks help them think clearly and feel more awake.This is because of caffeine,a kind of matter found in some plants.Caffeine helps to give a jumpstart to the nervous system.Now a new report says it may also improve long-term memory. Michael Yassa is a neurobiology professor at the University of California.He and other researchers wanted to know if caffeine could improve what they called memory consolidation.They asked a group of individuals to learn something new,then the same people were given caffeine,the active component in coffee,tea and chocolate. He and the other researchers worked with a group of l60 people who were Caffeinefree.On the first day,all the subjects were shown pictures of everyday objects.They were asked to identify whether the pictures could be found inside the house or outdoors.Some of the subjects were then given a caffeine pill,the others were given a placebo--a pill containing an inactive thing.On the second day,all of the subjects were asked to look at more pictures.Some of the images were exactly like the ones they had seen 24 hours early.But other images were different.And a third group of pictures was similar to the first group but a little different.The participants had to decide whether the images they saw were the same or different from the ones on the first day. Professor Yassa says their answers help to show the effects of caffeine on memory.He says those who took the caffeine pills had a ten to twelve percent increase in their ability to remember the objects.The amount of caffeine the researchers used in the study was similar to one strong cup of coffee. Professor Yassa says pills with a little more caffene also increased memory,but resulted in some participants appearing more nervous. What does this text mainly tell us? A) Coffeeis essential for people's work. B) Caffeine has negative effects on our health. C) Caffeine may help better long-term memory. D) Caffeine can lead to difficult sleeping and anxiety.
C
Q: Alone in the wilderness. Nothing but jungle. A world of shadow with the rays of light falling like blonde hair from the crowns of the giant trees. Jungle in the midday sun. Everything motionless. Not a sound from sky or earth. Complete silence. Only some coconuts falling, at long intervals, very far away. The world reduced to the soft touch of cool grass along my naked back, and a sweet smell of rich soil and vegetation. Stretched out with closed eyes beside my heavy burden of fruit and firewood, I enjoyed the feeling of fresh blood streaming through every part of my body and fresh jungle air filling every corner of my lungs. Resting motionless, I could see the sun through my closed eyelids, alone in the sky, as lonely as I, and as motionless and silent as everything else. The earth had surely stopped turning and somewhere on this planet there was supposed to be roaring traffic in busy streets. What a crazy, unbelievable thought! Another coconut fell, to make the world come to a complete standstill. I had to roll over onto my stomach to feel that at least I could move and make noises. Then I found company. A little brown ant was struggling to find its way with a bit of dry straw through the jungle of leaves and grass below my nose. I wondered if I could give the little fellow a lift with its burden, but it showed not the slightest sign of tiredness and struggled on with all six legs, head first or head last, waving its feelers energetically as if the trip had just started. Who ever saw a tired ant? Tiredness, disagreeable tiredness, is restricted to hunted animals, slaves and modern man. It is as great an effort for an office clerk to walk five blocks with a loaded brief-case as it is for a jungle-dweller to cross a valley with a goat on his back. It is as hard to get up and climb or run when you have been seated for years as it is to get up and walk when you have been in bed for months. The body is strange. Spare it, and you get really tired for almost nothing; use it, and almost nothing makes you really... We can learn from the passage that the author _ . A) enjoyed being alone B) experienced a world of quietness C) missed his busy life in the city D) had an unforgettable adventure
A: B