Astronaut Zhai Zhigang became the first Chinese man to walk in space on Saturday, climbing out of prefix = st1 /China's Shenzhou VII spacecraft in a technological feat that made the Chinese people excited. "I'm feeling quite well. I greet the Chinese people and the people of the world," Zhai said as he climbed out of the craft at around 16:40 Beijingtime, a historic achievement telecast live on CCTV. Tens of millions of Chinese viewers gathered before TV screens to watch the moment. Chinese President Hu Jintao and other top leaders had appeared at the BeijingAerospaceControlCenterto watch the live transmission of Zhai's spacewalk. Zhai, 42, chosen by an expert team for the first "extra-vehicular activity". unveiled a red national flag, helped by colleague Liu Boming, who also briefly popped his head out of the capsule. Zhai slowly made his way towards a test sample of solid lubricant outside the capsule, took a sample and handed it to Liu. Zhai safely returned inside the craft after about 20 minutes. The walk marked the high point of China's third manned space journey, which has received widespread media coverage. Zhai wore a$4.4 million Chinese-made suit weighing 120kg. Liu wore a Russian-made one and acted as a back-up. The third crew member, Jing Haipeng, monitored the ship from inside the re-entry module. The risky manoeuvre is a step towards China's longer-term goal of assembling a space lab and then a larger space station, analysts said. "On this flight, Chinese people's footprints will be left in space for the first time," said a commentary by the Xinhua News Agency. The astronauts embarked on their walk after receiving a clean bill of health from doctors on the ground at mission control in Beijing, Xinhua said. Zhai's suit has 10 layers and takes up to 15 hours to assemble and put on. China's first manned spaceflight was in 2003. A second, two-manned flight followed in 2005. The only other countries that have sent people into space are Russiaand theUnited States. What's the passage mainly about? A) A Chinese astronaut takes historic walk in space. B) China succeeded in launching Shenzhou VII into space. C) Chinese spacecraft arrives on the Mars. D) Chinacompetes in the space exploration.
A
Most people regard zoos as safe places for animals, where struggles such as difficulty finding food and avoiding predators don't exist. Without such problems, animals in zoos should live to a ripe old age. But that may not be true for the largest land animals on Earth. Scientists have known that elephants in zoos often develop diseases, joint problems and behavior changes. Sometimes, they even become unable to have babies. To learn more about how captivity affects elephants, a team of international scientists led by Mason, a biologist, compared the life spans of female elephants born in zoos with female elephants living outdoors in the wild. Zoos keep detailed records of all the animals in their care, documenting factors such as birth dates, illnesses, weight and death. These records made it possible for the researchers to analyze 40 years of data on 800 elephants in zoos. The team found that female elephants born in zoos lived an average of 16.9 years. Their wild counterparts who died of natural causes lived an average of 56 years----more than three times as long. Scientists don't yet know for sure why wild elephants seem to live so much better than their zoo-raised counterparts. Mason thinks stress and obesity may be to blame. Zoo elephants don't get the same kind of exercise as they do in the wild, and most are very fat. Elephant social lives are also much different in zoos than in the wild, where they live in large groups. Another finding from the study showed that elephants born in zoos were more likely to die earlier than elephants captured in the wild and brought to zoos. Mason suggests stress in the mothers in zoos might cause them to have babies that are less likely to survive. The study raises some questions about acquiring more elephants to keep in zoos. While some threatened and endangered species living in zoos reproduce successfully and keep healthy populations, that doesn't appear to be the case with elephants. The text tells us that zoo elephants are different from other zoo animals because they _ A) develop health problems. B) 1ive to a ripe old age. C) are not afraid of predators. D) have difficulty eating food.
A
(Question)
It is 7 o'clock in the morning. You check yourself in the mirror, adjust your collar, and consider the busy day ahead. But at least you know that the stress won't damage your health, for this is no ordinary set of clothes you are wearing. Set within the fabric are numerous sensors, constantly monitoring your vital signs. If danger signs are detected, the garment is programmed to contact your doctor and send a text message telling you to take it easy. Garments that can measure a wearer's body temperature or trace their heart activity are just entering the market, but the European project BIOTEX weaves new functions into smart textiles. _ biosensors in a textile patch can now analyse body fluids, even a tiny drop of sweat, and provide a much better assessment of someone's health. Jean Luprano, a researcher at the Swiss Centre for Electronics and Microtechnology (CSEM), coordinates the BIOTEX project. "One of the most obvious applications for smart fabrics is in the medical field," he says. "There has been a good deal of progress with physiological measurements, body temperature or electrocardiograms . But no one has yet developed biochemical sensing techniques that can take measurements from fluids like sweat and blood. We are developing a suite of sensors that can be integrated into a textile patch. The patch is a sensing and processing unit, adaptable to target different body fluids and biochemical species. At the very least, some basic biochemical analyses could complement the physiological measurements that can already be monitored. In some circumstances, fluidic analysis may be the only way to get information on a patient's health status." What is the text mainly about? A) How to make your day stress free. B) Biochemical sensing techniques. C) Smart clothes that track your health. D) New advancement in the medical field.
(Answer)
C