[单项选择]Many words in English have ______ new senses with the passage of time and social development.
A. embarked on
B. concentrated on
C. taken on
D. turned on

[单项选择]During these ten years, many new methods have been ______ in the field of foreign language teaching.
A. adopted
B. adapted
C. alarmed
D. aided

[单项选择]Some words are hard to （） because they have many different uses.
A. express
B. explain
C. define
D. describe

[单项选择]Many words are still ______ to me. I have to look them up in the dictionary.
A. gloomy
B. shadowy
C. miserable
D. obscure

[单项选择]How many of new Silent Riders were in regular service at the moment
A. None.
B. Twenty.
C. Fifty.
D. One.

[单项选择]

Passage Two
Millions of words have been written about young people in the United States. There are reasons for this great interest in the ideas, feelings, and actions of youth.
Today there are about seven million Americans in the colleges and universities. Young persons under twenty-five make up nearly half of the American population. Many of these will soon be in charge of the nation. Naturally, their ideas are important to everyone in the country, and it is necessary for older people to understand what they think and feel.
College students today have strong opinions about right and wrong. They are deeply interested in making a better life for all people, especially for those who have not been given a fair chance before now. They see much that is wrong in the lives of their parents. It is hard for them to see what is right and good in the older ways. As a result, there is often trouble in American families.

It can be concluded from the passage
A. it' s mere fuss to write so much about the ideas, feelings and actions of youth
B. the author blames the young for being trouble-makers at home
C. the author blames the parents for not understanding what their children think and feel
D. the trouble in American families is often .caused by different ideas and opinions between parents and children