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.

 Many students take Internet -based courses mainly because they can_____

A．) Earn their academic degrees with much less effort

B．) Save a great deal on traveling and boarding expenses

C．) Select courses from various colleges and universities

D．) Work on the required courses whenever and wherever

[单选题]Information-based occupations now take the______share of employment in many industrial societies such as the United States and the United Kingdom．A．largestB．smallestC．averageD．Dart

[主观题]Students can’t take magazines out of the reading room without permission.(改为被动语态)Magazines can’t ________ ________ out of the reading room without permission.

[单选题]Many of the students ______ the work although it took some time to learn how to do it.A． enjoyB． have to doC． hateD． ignore

[单选题]The Internet is based oil the concept of a(n)______relationship between computers．A．browser/serverB．client/serverC．conectionD．topology

[主观题]Students can't take magazines out of the reading room without permission（改为被动语态）Magazines can't________ ________out of the reading room without permission．

[单选题]H．ow many tablets should one take before he goes to sleep?A．oneB．twoC．one and halfD．three

[单选题]How many teeth didthe dentist [take out]?A.digB.drawC.pullD.extract

[单选题]H．ow many students were shot dead in 1997 in US schools?A． 10B． 9C． 12D． 22

[单选题]H．ow many students were shot dead in 1997 in the US schools?A． 9B． 10C． 12D． 22

[单选题]Once environmental damage ________,it will take many years for the system t