| Top marathon runners tend to be lean
and light, star swimmers are long thighs with huge feet and gold medal
weightlifters are solid blocks of muscle with short arms and legs. So, does your
physical shape—and the way your body works—fit you for a particular sport Or
does your body develop a certain way because of your chosen sport "It’s about 55:45, genes to the environment," says Mike Rennie, professor of clinical physiology at Britain’s University of Nottingham Medical School. Rennie cites the case of identical twins from Germany, one of whom was a long-distance athlete, the other a powerful sportsman, so, "They look quite different, despite being identical twins." Someone who’s 1.5-meters tall has little chance of becoming an elite basketball player. Still, being over two meters tall won’t automatically push you to Olympic A. physical strength is more important for sportspersons’ success B. training conditions are more important for sportspersons’ success C. genes are more important for sportspersons’ success D. psychological conditions are more important for sportspersons’ success [单项选择]Passage 2
The top of the world is a wonderland. In winter, the temperature often falls to -30°F and the sun never rises. The ocean is surrounded by frozen ground. There are few people or trees, but to polar bears, the Arctic(北极)is home.
(78) Polar bears have thick fur, big paws and other features that make them well prepared for life in their tough environment. In fact, they need the Arctic sea ice for survival. But climate change is causing larger and larger areas of summer sea ice to melt(融化). Experts say that if warming patterns continue, the Arctic could be free of summer sea ice by 2050. That may cause two-thirds of the world’s 20,000 polar bears to be gone by then too.
Polar bears can’t survive for long on land. Seals are their main source of food. The only place where polar bears can hunt seals is on the ice. (79) Although these bears are strong swimmers, they are no match for lightning swift seals in the water. A polar bear has brilliantly clever strategies to overcom
A. On land B. In open water. C. In openings in the sea ice. D. At the bottom of the sea. [单项选择] Passage 1
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