【正文】 the camp you can kick off your boots and enjoy excellent food and wine. Looking back on your day, you will find it hard to deny that a horseback Safari is as close as you will ever e to answering the call of the wild.21. What does the author find most exciting about a horse safari?A. Seeing and feeling the real African life.B. Enjoying good food and wine at the camp.C. Hunting large animals just as our ancestors did.D. Being part of the scene and getting close to animals.22. What does the underlined word sedate probably mean?A. Wild and romantic B. Slow and peacefulC. Hurry and thirsty D. Active and excited23. The author introduced the riding experience in the Okavango Delta mainly by________.A. Following space order B. Following time orderC. Making classifications D. Giving examplesBScientists have long had it in their mind to make a robot lizard (蜥蜴). They began with finding out why a lizard can hang on a wall. They noticed the lizard’s toes were unique: they have suckers (吸盤), which enable it to hang on walls. They, therefore, made a robot with suckers on its hands and feet.The robot could hang on the wall but fell off when climbing. So, they went on researching. 6 years ago, scientists discovered that suckers only were not enough. It is the bristles (剛毛) on each foot that adds friction (摩擦) and static adsorption (靜電吸附力) that makes a lizard move on the smooth wall easily without falling down. Then scientists made great efforts to fix thick bristles to the robot’s hands and feet. However, the effect was not satisfactory. The robot still couldn’t attach itself firmly to the wall. Scientists got puzzled: how on earth can the lizard climb on an extremely smooth wall or even on a ceiling without dropping off? An accidental finding inspired them. One day a scientist happened to see a cat attack a lizard and bite off its tail. The lizard broke away from the cat’s teeth and threw itself on a wall to escape, only to fall off heavily on the ground. The scientist wondered: is it the tail that plays an important role in its travelling on the wall? He caught some lizards for an experiment. The result proved his assumption: a tailless lizard has no trouble walking on an ordinary wall but can’t on a smooth one. A further study showed the lizard’s tail can prevent it falling over backward and, what’s more, that the tail acts as an additional leg while one of the lizard’s legs leaves the wall, which is always the case while it is walking on the wall. Thus, Tailbot, a super tailed robot, is born. 24. What part(s) would be a must if scientists just wanted a robot which can hang on the wall? A. Suckers. B. Suckers and bristles. C. Suckers, bristles and a tail. D. Hands, feet, bristles and a tail.25. The bristles function as something ________. A. to protect the lizard’s toes from injury B. to produce friction and static adsorptionC. to prevent a lizard falling over backwardD. to help a lizard move about without falling26. The biggest importance of a lizard’s tail lies in ________.A. serving as another leg B. helping support the body C. sticking to the wall D. stopping slipping 27. What does the underlined part in the fifth paragraph refer to?A. A lizard often falls over backward while it travels on the wall.B. A lizard often has three legs on the wall while walking on the wall. C. A lizard’s tail will replace one of its legs while it moves on the wall.D. A lizard’s tail often stops it fall over backward while moving on the wall.COn her first morning in America last summer, my daughter went out to explore her new neighborhood alone, without even telling my wife or me. Of course we were worried。 we had just moved from Berlin, and she was just 8. But when she came home, we realized we had no reason to panic. Beaming with pride, she told us how she had discovered the little park around the corner, and had made friends with a few local dog owners. When this story es up in conversations with American friends, we usually meet with polite disbelief. Most are horrified by the idea that their children might roam(閑逛) around without adult supervision. A study by the University of California has found that American kids spend 90 per cent of their leisure time at home, often in front of the TV or playing video games. Such narrowing of children39。s world has happened across the developed world. But German parents are gene