*Question*
Read the article and select the best answer. Article: When scientists accidentally killed what turned out to be the world's oldest living creature, it was bad enough. Now, their mistake has been worsened after further research found it was even older - at 507 years. The ocean quahog, a type of deep-sea clam, was dredged alive from the bottom of the North Atlantic near Iceland in 2006 by researchers. They then put it in a fridge-freezer, as is normal practice, unaware of its age. It was only when it was taken to a laboratory that scientists from Bangor University studied it and concluded it was 400 years old. The discovery made it into the Guinness Book of World Records. However, by this time, it was too late for Ming the Mollusc , named after the Chinese dynasty when its life began. Unfortunately researchers who calculated Ming's age killed it instantly by opening its shell. The researchers opened the ancient clam up to judge its age by counting growth rings inside. But the rings were so close together that scientists ended up having to count the rings on the outside to be accurate, leading CBS journalists to point out that if scientists had just started there, Ming could have lived on. Now, after examining the quahog more closely, using more advanced methods, the researchers have found the animal was actually 100 years older than they first thought. Dr Paul Butler, from the University's School of Ocean Sciences, said: "We got it wrong the first time and maybe we were a bit hasty publishing our findings back then. But we are absolutely certain that we've got the right age now." The mollusc was born in 1499 - just seven years after Columbus discovered America and before Henry VIII had even married his first wife, Catherine of Aragon in 1509. A quahog's shell grows by a layer every year, in the summer when the water is warmer and food is plentiful. It means that when its shell is cut in half, scientists can count the lines in a similar way that trees can be dated by rings in their trunks. Jan Heinemeier, associate professor at the University of Denmark, who... Question: At first, the scientists found that _ . Options: A: The ocean quahog got a deadly disease B: The growth rings inside were so close together C: it was accurate to count the growth rings outside D: The ocean quahog was 400 years old
**Answer**
D

*Question*
Read the article and select the best answer. Article: Scientists have devised a way to determine roughly where a person has lived using a strand of hair, a technique that could help track the movements of criminal suspects or unidentified murder victims. The method relies on measuring how chemical variations in drinking water show up in people's hair. "You're what you eat and drink, and that's recorded in your hair," said Thure Cerling, a geologist at the University of Utah. While U.S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as rain clouds move. Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes . The heaviest rain falls first. As a result, storms that form over the Pacific deliver heavier water to California than to Utah. Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline. Each inch of hair corresponds to about two months. Cerling's team collected tap water samples from 600 cities and constructed a map of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops. They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of rain systems. "It's not good for pinpointing ," Cerling said. "It's good for eliminating many possibilities." Todd Park, a local detective, said the method has helped him learn more about an unidentified woman whose skeleton was found near Great Salt Lake. The woman was 5 feet tall. Police recovered 26 bones, a T-shirt and several strands of hair. When Park heard about the research, he gave the hair samples to the researchers. Chemical testing showed that over the two years before her death, she moved about every two months. She stayed in the Northwest, although the test could not be more specific than somewhere between eastern... Question: What does the author mean by "You're what you eat and drink" (Line 1, Para.3)? Options: A: Food and drink affect one's personality development. B: Food and drink preferences vary with individuals. C: Food and drink leave traces in one's body tissues. D: Food and drink are essential to one's existence.
**Answer**
C

*Question*
Read the article and select the best answer. Article: Children at school need this type of memory on a daily basis for a variety of tasks, such as following teachers' instructions or remembering oral sentences. During the study, volunteers were asked to perform one of two simple tasks during which researchers checked to ask if the participants' minds were wandering. At the end, participants measured their working memory ability by remembering a series of letters with simple maths questions. Daniel, a psychologist in the United States, said that those with higher working memory ability reported "more mind wandering during these simple tasks", but their performance did not suffer. The results, published online in the journal Psychological Science, appear to confirm previous research that found working memory allows humans to deal with multiple thoughts at the same time. Dr Smallwood,in Leipzig,Germany,said: "What this study seems to suggest is that, when circumstances for the task aren't very difficult, people who have additional working memory resources arrange _ to think about things other than what they're doing. " Working memory ability is also associated with general measures of intelligence, such as reading comprehension and IQ scores, and also offers a window into the widespread, but not well understood, field of internally driven thoughts. Dr Smallwood added: "Our results suggest the sorts of planning that people do quite often in daily life--when they are on the bus, when they are cycling to work, when they are in the shower--are probably supported by working memory. Question: Researcher can learn if the participants' minds were wandering by _ . Options: A: checking it on the computer B: following a series of instructions C: asking them while they are performing tasks D: measuring their working memory ability
**Answer**
C