2.What is the researchers' concern over the increase of birds' song output? A. The environment might be polluted. B. The birds' health might be damaged. C. The industry cost might be increased. D. The people's hearing might be affected.

3.What does the underlined word "nocturnal" in Paragraph 5 mean? A. Active at night.　　　　　　　　　　　　　 　 B. Inactive at night. C. Active during the day.　　　　　　　 D. Inactive during the day.

4.Why do some birds thrive in noisy environments? A. Because there are fewer dangers. B. Because there is more food to eat. C. Because there is less light pollution D. Because there are more places to take shelter.

4. [.天津] Whether in the home or the workplace, social robots are going to become a lot more common in the next few years. Social robots are about to bring technology to the everyday world in a more humanized way, said Cynthia Breazeal, chief scientist at the robot company Jibo. While household robots today do the normal housework, social robots will be much more like companions than mere tools. For example, these robots will be able to distinguish when someone is happy or sad. This allows them to respond more appropriately to the user. The Jibo robot, arranged to ship later this year, is designed to be a personalized assistant. You can talk to the robot, ask it questions, and make requests for it to perform different tasks. The robot doesn’t just deliver general answers to questions; it responds based on what it learns about each individual in the household. It can do things such as reminding an elderly family member to take medicine or taking family photos. Social robots are not just finding their way into the home. They have potential applications in everything from education to health care and are already finding their way into some of these spaces. Fellow Robots is one company bringing social robots to the market. The company’s “Oshbot” robot is built to assist customers in a store, which can help the customers find items and help guide them to the product’s location in the store. It can also speak different languages and make recommendations for different items based on what the customer is shopping for. The more interaction the robot has with humans, the more it learns. But Oshbot, like other social robots, is not intended to replace workers, but to work alongside other employees. “We have technologies to train social robots to do things not for us, but with us,” said Breazeal.

1. How are social robots different from household robots? A. They can control their emotions.　　　　 B. They are more like humans. C. They do the normal housework.　　　　　　 D. They respond to users more slowly.

3. What can Oshbot work as? A. A language teacher.　　　　　　　　　 B. A tour guide. C. A shop assistant.　　　　　　　　　　　　 D. A private nurse.

4. We can learn from the last paragraph that social robots will ______. A. train employees　　　　　　　　　　　 B. be our workmates C. improve technologies　　　　　　　　 D. take the place of workers

5. What does the passage mainly present? A. A new design idea of household robots. B. Marketing strategies for social robots. C. Information on household robots. D. An introduction to social robots.