Now ______ is very serious. Some rivers and lakes are ______.

A. pollution；pollute B. polluted；pollution

C. pollution；polluted D. pollute；polluted

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Have you noticed your life becoming a little easier? Now, when you go to a certain shopping mall, you can enjoy its free Wi-Fi there. When you want to take a taxi, you can book one with your phone. In fact, all these can be seen as the basic parts of a smart city.

The idea of a smart city was brought up by US company IBM in 2010. Generally, a smart city is a city that uses digital technologies such as the Internet to improve city planning, save money and resources, and make our lifeconvenient. How smart can a city be? Here are great examples that we can learn from.

In 2009, Dubuque became the first smart city in the US. The city used smart water meters to take the place of traditional water meters. They can detect（探測〉water waste and leakage（泄漏）and send data to let the house owner know. The same system is used for other city resources like electricity and natural gas. This way, people know how they use their resources and are glad to help reduce waste.

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C. Smart cities are very common in both Dubuque and Santander.

D. Spain and the US take the leading position in building smart cities.

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