B．y almost any measure , there is a boom in Internet-based instruction . In just a few years , 34 percent of American universities have begun offering some form of distance learning (DL), and among the larger schools , it’s closer to 90 percent . If you doubt the popularity of the trend, you probably haven’t. It enrolls 90,000 student, a statistic used to support its claim to be the largest private university in the country.

While the kinds of instruction offered in these programs will differ, DL usually signifies a course in which the instructions post syllabi(课程大纲), reading assignments , and schedules on Websites , and students send in their assignments by e-mail . Generally speaking, face-to-face communication with an instructor is minimized or eliminated altogether.

A．ccording to the passage , distance learning is basically characterized by_____

A．) A considerable flexibility in its academic requirements

B．) The great diversity of students’ academic backgrounds

C．) A minimum or total absence of face-to-face instruction

D．) t the casual relationship between students and professors

[单选题]A．ccording to tile passage, language learners can reduce the number of their mistakes by ______.A． asking native speakers for explanationsB． reading good books in the foreign languageC． comparing their speech with that of native speakersD． paying no

[单选题]A．ccording to this passage,A．brokers usually perform. the same kinds of services to their customers.B．brokers have little contact with each other.C．open competition tends to result in a common price for similar transactions at any given moment.D．chan

[单选题]A．ccording to the passage, Katy __________________.A． likes travelling very much B. doesn’t want to live with a familyC． only teaches writing in English D. will go back to school after she leaves Nepal

[单选题]A．ccording to the passage, the suburbs ______.A． were deserted at nightB． became larger and largerC． had a high construction costD． had some declined business center

[单选题]A．ccording to the passage, the ancestors of the Potter family most probably _______.A． owned or drove a cartB． made things with metalsC． made kitchen tools or containsD． built houses and furniture

[单选题]A．ccording to the passage, the group with the highest AIDS rate is_________ .A． the white AmericansB． African-American menC． the American womenD． the black American women

[单选题]A．ccording to this passage, which of the following is true?A． The Negroes came to North America in order to work for the earliest immigrants.B． The Negroes also belonged to the earliest immigrants to the North America.C． The Negroes were brought to A

[单选题]A．ccording to this passage, if the cylinder non-return valve were not leakyA．an explosion would not be causedB．there still would be a danger of explosionC．oil would not deposit in the air pipeD．pipe lines would not have to be drained

[单选题]A．ccording to the passage, the screen or cutters are fitted to __ (1)kill bacteria (2)break up the solid waste (3)remove solid matter with large sizeA．(1)B．(2)C．(2)(3)D．None of (1)(2)(3) is true

[单选题]A．ccording to the passage, it is recommended that the heat exchanger side be cleaned by .A．flushing with chemical solvent without being dismantledB．brushing mechanically after being disassembledC．flushing with flesh water onlyD．flushing with clean oi