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阅读下列短文，从每题所给的四个选项(A、B、C和D)中选出最佳选项。A "Motherhood may make women smarter and may help prevent dementia(痴呆) in old age by bathing the brain in protective hormones," US researchers reported on Thursday. Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s dementia (早老痴呆症). University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans. "Our research shows that the hormones of pregnancy (怀孕) are protecting the brain, including estrogen (雌激素), which we know has many neuroprotective (保护神经的) effects," Kinsley said. "It’s rat data but humans are mammals just like these animals are mammals," he added in a telephone interview. "They go through pregnancy and hormonal changes." Kinsley said he hoped public health officials and researchers would look to see if having had children protected a woman from Alzheimer’s dementia and other forms of age-related brain decline. "When people think about pregnancy, they think about what happens to the baby and the mother from the neck down," said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida. "They do not realize that hormones are washing on the brain. If you look at female animals who have never gone through pregnancy, they act differently to the young. But if she goes through pregnancy, she will sacrifice her life for her infant--that is a great change in her behavior that shows the genetic alterations(改变) to the brain. " What does the phrase "litters of pups" mean in the second paragraph
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初产妇第三产程的时间是( )。
阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中选出能填入相应空白处的最佳选项。 As she walked round the large shop, Edith realized how difficult it was to choose a suitable Christmas (36) for her father. She (37) that he were as easy to please as her mother, who was (38) satisfied with perfume. (39) , shopping at this time of the year was a most (40) job. People (41) on your feet, pushed you with their shoulders and almost (42) you over in their hurry in order to (43) something cheap ahead of you. Partly to have a rest, Edith paused in front of a counter, where some beautiful ties were on (44) . "They are (45) silk," the shop assistant told her with a smile trying to (46) her to buy one. But Edith knew from past (47) that her choice of ties hardly ever pleased her father. She moved on slowly and then, quite by chance, (48) where a small crowd of men had gathered round a counter. She found some fine pipes on sale and the (49) were very beautiful. Edith did not hesitate for long. Although her father (50) smoked a pipe once in a while, she believed this was (51) to please him. When she got home, with her small but (52) present hidden in her handbag, it was time for supper and her parents were already (53) table. Her mother was in great (54) . "Your father has at last decided to stop smoking," she told her daughter happily. Edith was so (55) that she could not say a single word.
What is the probable relationship between the two speakers
E Beijing is to spend up to ＄20 billion to change the Chinese capital into a 21 st-century one for the 2008 Olympics. The government managed to host the 2008 Olympics. The general aim is for Beijing to have the same environmental standards as Paris, London or Washington by 2008. Hundreds of millions of dollars will be spent piping natural gas to the city’s homes and taking away dirty coal burning gradually while 60, 000 buses will be changed to liquefied gas. The money will also be used for relocating the polluting factories and building green belts. By 2008 around 90 percent of Beijing’s waste will be treated, compared to only 40 percent at present. Olympic officials have already announced that around 50 large projects are being dealt with to improve traffic congestion and cut down pollution, They include the construction of Beijing’s first light railway, a 40.5-kilometer line which is expected to be completed in 2005. Beijing, besides, plans to build an 82.25-kilometer-long subway to add to the existing 53 kilometers. Nine major roads will be rebuilt or widened. Beijing also plans to build a 70-meter-wide green belt among the waterways to protect the water quality as well as to increase the green areas. This news report mainly talks about ______.
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