B．where citizens take more pride in their original culture

　　C．that is mostly settled by Europeans and Africans

　　D．where 81% of the population are immigrants

　　解析：选A　细节理解题。根据第二段的"Since the 20th century, the country has become a heaven for people from all over the globe."可知应选A。

　　3．Where did most people live before many immigrants came to America?

　　A．In the urban areas.

　　B．In the rural areas.

　　C．In the southern part of America.

　　D．In the northern part of America.

　　解析：选B　细节理解题。根据第三段的"The arrival of immigrants has shifted populations from rural areas into cities because immigrants tend to settle in urban areas."可知，大量移民涌入美国之前，他们大多居住在乡下。

　　4．We can learn from the sixth paragraph that ________.

　　A．diversity has existed in America in almost every aspect

　　B．most posts in America state governments are help by mixed­race people

　　C．equality and freedom make America a fair country

　　D．diversity has greatly affected the American political field　

　　解析：选D　推理判断题。根据第六段内容可知，多元化对美国的政治领域有很大影响。

　　B

　　In 2011, a law was born.A type of ladybug (瓢虫) became the state insect of North Dakota.When the governor signed the bill into law, four kids stood behind him.These second­grade students had helped create a law!

　　Jaden McNeiley, Logan Redding, Megan Zimmer, and Isabel Sieg were in first grade when their idea for a law was born.They were studying the ladybug in school.

　　Megan and Logan were farm kids and knew something about the ladybug already.They knew that farmers had a problem with crop­eating pests called aphids (蚜虫) and that ladybugs ate aphids.The more ladybugs were around, the fewer chemicals the farmers had to use.

　　The kids were reading an article on the computer when they saw a link that led to a list of state insects.They clicked on the link and couldn't believe their eyes.North Dakota did not have a state insect!

The kids decided that a kind of ladybug called the convergent lady beetle should be their state insect.This ladybug was of great benefit to their farming state and it deserved a