单选题The word "imperative" ( Line 4 ,Para. 1 ) most probably refers to something ______.

单选题His composition was so confusing that I could hardly make any of it whatsoever.

单选题 Questions 12 to 15 are based on the conversation you have just heard.

单选题Included in the______ of the public schools in the United States is the socialization of the school-age population.

单选题Passage OneQuestions 26 to 28 are based an the passage you have just heard.

单选题[A] exact [C] certain[B] definite [D] decisive

单选题Microsoft will be targeted as an abusive monopoly because ______.

单选题My grandfather had always taken a ______ interest in my work, and I had an equal admiration for the stories of his time.

单选题Questions 19 to 21 are based on the passage you have just heard.

单选题[此试题无题干]

单选题[此试题无题干]

单选题According to the author, anthropologists would have all cultures viewed ______.

单选题The test results are beyond ______; they have been repeated in labs all over the world.

单选题 Drug abuse can cause a wide variety of adverse physical reactions. Long-term drug use may {{U}}(67) {{/U}} the heart, liver, and brain. Drug abusers may suffer from {{U}}(68) {{/U}} if they habitually forget to eat, {{U}}(69) {{/U}} afford to buy food, or eat foods {{U}}(70) {{/U}} the proper vitamins and minerals. Individuals who abuse injectable drugs risk {{U}}(71) {{/U}} infections such as hepatitis and HIV from dirty needles or needles shared with other {{U}}(72) {{/U}} abusers. One of the most dangerous effects of {{U}}(73) {{/U}} drug use is the potential for overdosing -- {{U}}(74) {{/U}} is, taking too large or too strong a dose for the body's systems to handle. A drug overdose may cause an individual to lose {{U}}(75) {{/U}} and to breathe inadequately. Without treatment, an individual may die {{U}}(76) {{/U}} a drug overdose. Drug {{U}}(77) {{/U}} is marked by an irresistible thirst {{U}}(78) {{/U}} a substance. Successful treatment methods vary and include psychological counseling, or psychotherapy, and detoxification programs- medically supervised programs that {{U}}(79) {{/U}} wean (戒除) an individual from a drug {{U}}(80) {{/U}} a period of days or weeks. Detoxification and psychotherapy are often used together. The illegal use of drugs was once considered a problem {{U}}(81) {{/U}} to residents of poor, urban neighborhoods. Today, however, people from all {{U}}(82) {{/U}} levels, in both cities and suburbs, abuse drugs. Some people use drugs to {{U}}(83) {{/U}} stress and to forget about their problems. Genetic factors may predispose {{U}}(84) {{/U}} individuals to drug addiction. {{U}}(85) {{/U}} factors such as peer pressure, especially in {{U}}(86) {{/U}} people, and the availability of drugs, also influence people to abuse drugs.

单选题______ of 70 years old, he decided to sail single-handed across the Pacific Ocean.