Question: Read the following article and answer the question. Article: If you are invited to a party by the Austrians and the suggested dress is "informal " (usually marked in the lower left-hand coner of the invitation) , it may mean dark suit and a white shirt for men and cocktail dress( ) for women. Or again, may mean something considerably less formal. "Formal" means a black tie and evening dress for men and a floor-length dress for women. If a man is in doubt  about what to wear, he may come slightly overdressed and then take his coat and tie off when he sees that others are wearing sports shirts. National dress is always acceptable. Question: If a lady receives an invitation marked with "formal", she should wear Answer:
Answer: a long dress

Question: Read the following article and answer the question. Article: Domestic   horses now pull ploughs, race in the Kentucky Derby, and carry police. But early horses weren't tame   enough to perform these kinds of tasks. Scientists think the first interactions humans had with horses were far different from those today. Thousands of years ago, people killed the wild horses that lived around them for food. Over time, people began to catch the animals and raise them. This was the first step in domestication. As people began to tame and ride horses, they chose to keep those animals that had more desirable characteristics. For example, people may have chosen to keep horses that had a gentle personality so they could be ridden more easily. People who used horses to pull heavy loads would have chosen to keep stronger animals. Characteristics like strength are partly controlled by the animals' genes. So as the domesticated horses reproduced, they passed the characteristics on to their young. Each new generation of houses would show more of these chosen characteristics. Modern day horse breeds come in a wide variety of shapes and sizes. This variety didn't exist in the horse population before domestication. The Shetland horse is one of the smallest breeds--typically reaching only one meter tall. With short, strong legs, the animals were bred to pull coal out of mine shafts   with low ceilings. Huge horses like the Clydesdale came on the scene around 1700. People bred these heavy, tall horses to pull large vehicles used for carrying heavy loads. The domestication of horses has had great effects on societies. For example, horse were important tools in the advancement of modern agriculture. Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently. Before they were able to ride horses, humans had to cross land on foot. Riding horses allowed people to travel far greater distance in much less time. That encouraged populations living in different areas to interact with one another. The new from of rapid transportation helped cultures spread around the world. Question: Before domestication horses were   _  . Answer:
Answer: hunted for food

Question: Read the following article and answer the question. Article: Suppose we built a robot to explore the planet Mars. We provide the robot with seeing detectors  to keep it away from danger. It is powered entirely by the sun. Should we program the robot to be equally active at all times? No, the robot would be using up energy at a time when it was not receiving any. So we would probably program it to stop its activity at night and to wake up at dawn the next morning. According to evolutionary  theory of sleep, evolution equipped us with a regular pattern of sleeping and waking for the same reason. The theory does not deny that sleep provides some important restorative functions. It merely says that evolution has programmed us to perform those functions at a time when activity would be inefficient and possibly dangerous. However, sleep protects us only from the sort of trouble we might walk into; it does not protect us from trouble that comes looking for us. So we sleep well when we are in a familiar, safe place, but we sleep lightly, if at all, when we fear that bears will nose into the tent. The evolutionary theory explain the differences in sleep among creatures. Why do cats, for instance, sleep so much, while horses sleep so little? Surely cats do not need five times as much repair and restoration as horses do. But cats can afford to have long periods of inactivity because they spend little time eating and are unlikely to be attacked while they sleep. Horses must spend almost all their waking hours eating, because what they eat is very low in energy value. Moreover, they cannot afford to sleep too long or too deeply, because their survival depends on their ability to run away from attackers. Question: Evolution has programmed man to sleep at night chiefly to help him   _  . Answer:
Answer: