Though these robots are useful, by their very nature they are unreliable, extremely expensive, and they break easily. Question 150: According to paragraph 1, the following are disadvantages of the common robots which have been on Mars, EXCEPT__________. A. uselessness B. high manufacturing cost C. fragility D. difficulty in moving ------------------------------------------------------------------------------------------------------------------ A snakebot would be able to do these things, too, making it much more effective than regular robots with wheels, which easily get stuck or fall over. Since they can carry tools, snakebots would be able to work in space, as well ------------------------------------------------------------------------------------------------------------------ Question 151: What does the word “they” in the second paragraph refer to _______? A. Wheels B. regular robots C. these things D. snakebots ------------------------------------------------------------------------------------------------------------------ The modular design of the snakebot has many advantages. If one module fails, another can be added easily. Snakebot modules can also carry different kinds of tools, as well as cameras. Since each module is actually a robot in itself, one module can work apart from the rest if necessary 153. The author implied in paragraph 4 that A. the head of the snake has something wrong. B. all the modules cannot reconnect with each other. C. the whole parts of the snake are broken down. D. the energy battery in the snakebot runs out of. ------------------------------------------------------------------------------------------------------------------ “If things around them are clean and tidy, peop1e behave cleanly and tidily. If they are surrounded by squalor, they behave squalidly." Question 160: The word 'they in the last paragraph may refer to _______ _. A. people B. the environment C. much of Britain D. cleanliness ------------------------------------------------------------------------------------------------------------------ People who live in urban areas have very different consumption patterns than residents in rural areas. For example, urban populations consume much more food, energy, and durable goods than rural populations. In China during the 1970s, the urban populations consumed twice as much pork as the rural populations who were raising the pigs. With economic development, the difference in consumption declined as the rural populations ate better diets. But even a decade later, urban populations had 60 percent more pork in their diets than rural populations. The increasing consumption of meat is a sign of growing affluence in Beijing; in India where many urban residents are vegetarians, greater prosperity is seen in higher consumption of milk. Which of the following is TRUE about the food consumption of Chinese urban inhabitants? A. People in urban areas ate less than those in rural areas in the past B. Urban civilians prefer more milk in their diets than pork. C.People breeding the pigs in the past often had less pork in their diets than those in urban areas. D.The pork consumption in urban areas has experienced a downward trend. ------------------------------------------------------------------------------------------------------------------ But even a decade later. urban populations had 60 percent more pork in their diets than rural populations. Question 164: The word "their" in paragraph 2 refers to _____ _. A. the urban residents' B. the rural populations' C. pigs' D. Chinese citizens' ------------------------------------------------------------------------------------------------------------------ Many of the effects of urban areas on the environment are not necessarily linear. Bigger urban areas do not always create more environmental problems. And small urban areas can cause large problems. Much of what determines the extent of the environmental impacts is how the urban populations behave — their consumption and living patterns — not just how large they are