The existence of electricity in the air has been known ______.A.for hundreds of yearsB.for
The existence of electricity in the air has been known ______.
A.for hundreds of years
B.for several years
C.recently
D.for thousands of years
The existence of electricity in the air has been known ______.
A.for hundreds of years
B.for several years
C.recently
D.for thousands of years
gance is synonymous(同义词) with good taste, and harmony.
A、moods
B、postures
C、frames
D、standings
According to the passage, static electricity can be caused by ______.
A.using home-made electrical goods
B.wearing clothes made of natural materials
C.walking on artificial floor coverings
D.sorting food in a refrigerator
What is offered to Jack McCarrol in the e-mail?
A.Access to a members-only Web site
B.An electronic version of his receipt
C.Information about upcoming members-only events
D.A free listing of his business in the membership directory
The brain controls the other body activities through
A.medical devices.
B.small electrodes.
C.the brain waves.
D.the nerve cells.
The word "carbon" (Line 5, Para. 2) Stands for ______.
A.intelligent robots
B.a chemical element
C.an organic substance
D.human beings
GS1系统是可持续发展的。随着信息技术的发展与应用,该系统也在不断发展和完善。产品电子代码(Electronic Product Code,EPC)就是该系统的新发展。()
A.The existence of various kinds of schools.
B.The educational problem of American minorities.
C.The existence of functional illiterates.
D.The existence of private schools.
The information superhighway came into existence because of ______.
A.copper wire cables
B.satellite communication
C.optical fibers
D.laser and optical fibers
A.development
B.existence
C.prosperity
D.advance