根据中文意思填入恰当的词

The pop singer ____ ________ making his fans happy in a variety of ways. 用种种方法成功地是他的歌迷们感到很开心。

The pop singer ____ ________ making his fans happy in a variety of ways. 用种种方法成功地是他的歌迷们感到很开心。

由于多种原因，她不得不离开学校到一家工厂去上班。(a variety of)

A study has found that people who appear to be constantly distracted (分心) have more “working

memory”, giving them the ability to hold a lot of information in their heads and handle it mentally．

Children at school need this type of memory on a daily basis for a variety of tasks, such as following teachers' instructions or remembering oral sentences.

During the study, volunteers were asked to perform one of two simple tasks during which researchers checked to ask if the participants' minds were wandering.

At the end, participants measured their working memory ability by remembering a series of letters with simple maths questions.

Daniel, a psychologist in the United States, said that those with higher working memory ability reported “more mind wandering during these simple tasks”, but their performance did not suffer．

The results, published online in the journal Psychological Science, appear to confirm previous research that found working memory allows humans to deal with multiple (多种多样的) thoughts at the same time.

Dr Smallwood，in Leipzig，Germany，said: “What this study seems to suggest is that, when circumstances for the task aren’t very difficult, people who have additional working memory resources arrange them to think about things other than what they're doing. ”

Working memory ability is also associated with general measures of intelligence, such as reading comprehension and IQ scores, and also offers a window into the widespread, but not well understood, field of internally (内部地) driven thoughts．

Dr Smallwood added: “Our results suggest the sorts of planning that people do quite often in daily life—when they are on the bus, when they are cycling to work, when they are in the shower—are probably supported by working memory.

72. What can be a suitable title for the text?

A. Why wandering mind is necessary              B. A new measure to test IQ

C. The importance of working memory             D. Wandering mind is sharper

73. Researcher can learn if the participants' minds were wandering by       .

A. checking it on the computer

B. following a series of instructions

C. asking them while they are performing tasks

D. measuring their working memory ability

74. The underlined word “them” refers to       .

A. the participants             B. the working memory resources

C. the tasks                         D. the working circumstances

75. What can we learn from the passage?

A. It's not a bad thing for children with wandering minds.

B. The result of the study doesn't agree with the previous research.

C. Circumstances might make children's heads clever.

D. Only working memory can handle difficult problems.

The United States of America is the most culturally diverse(多样化) country in the world in terms of culture religion, ethnicity(种族) and sexual orientation. As a combination of various races and cultures, America is home to all. The culture here is so unique that citizens can be just as proud of their original cultural heritage(遗产) as they are to be American.
What is now the US was initially inhabited(居住) by native people until the land was settled by various European groups and African slaves. Since the 20th century, the country has become a heaven for people from all over the globe(全球).
The arrival of immigrants(移民) has shifted populations from rural(农村的) areas into cities because immigrants tend to settle in urban areas. At present, 81 percent of the inhabitants in the US live in cities.
Cultural and ethnic diversity adds a unique flavor to cities that is expressed through distinct(独特的) neighborhoods, restaurants, places of worship, museums, nightlife and multicultural learning environments.
Unique musical forms, such as jazz, rock and roll, Chicano music, and the blues, grow in the US by mixing a variety of culturally distinct musical traditions to create a new form.
At the executive (行政的) level, the country is headed by a mixed­race president; two posts(职位) on the Supreme Court are held by members of the country's two largest minorities.There is also diversity in state and local governments.
Without its rich mixture of races and cultures, America would not be the nation that it is today. Founded upon the basis of equality and freedom, America acts as a stage where different cultures not only co­exist peacefully, but develop well.
【小题1】According to the passage, America is a country________.