The world would be a better place if everyone showed _____ cooperation as John.
By the time Chris _____, we _____ watching the film.
He couldn't buy a new car because he got _____ money.
Choose the underlined part that needs correction.
We went by the train to the west of England last month.
Choose the underlined part that needs correction.
Neither of the girls have turned in the term papers to the instructor yet.
Choose the underlined part that needs correction.
The teacher's uninterested approach toward the debaters made it hard to know which side she supported.
Choose the underlined part that needs correction.
My friends and me had gone on holiday to a little town on the south coast before we came back to school.
Choose the underlined part that needs correction.
The Kingfisher group, which name was changed from Woolworths earlier this year, includes about 720 high street shops.
Choose the sentence that is closest in meaning to this sentence.
Unless they comply with the rules, they won't be allowed back into the club.
Choose the sentence that is closest in meaning to this sentence.
“You must never play truant again." said their mother.
Choose the sentence that is CLOSEST in meaning to the sentence given.
None of his classmates can compete with him as regards his mathematical genius.
Choose the sentence that is CLOSEST in meaning to the sentence given.
You can wear a tie in our office if you’d like but it’s not an obligation.
Choose the sentence that is closest in meaning to this sentence.
We have decided that the work they do is unacceptable.
Read and choose the correct answer for each question.
Nanotechnology refers to the creation and use of materials or devices at extremely small scales. These materials or devices fall in the range of 1 to 100 nanometers (nm). One nm is equal to one-billionth of a meter (0.000000001 m), which is about 50.000 times smaller than the diameter of a human hair. Scientists refer to the dimensional range of 1 to 100 nm as the nanoscale, and materials at this scale are called nanocrystals or nanomaterials.
The nanoscale is unique because nothing solid can be made any smaller. It is also unique because many of the mechanisms of the biological and physical world operate on length scales from 0.1 to 100 nm. At these dimensions, materials exhibit different physical properties; thus scientists expect that many novel effects at the nanoscale will be discovered and used for breakthrough technologies.
A number of important breakthroughs have already occurred in nanotechnology. These developments are found in products used throughout the world. Some examples are catalytic converters in automobiles that help remove air pollutants, devices in computers that read from and write to the hard disk, certain sunscreens and cosmetics that transparently block harmful radiation from the Sun, and special coatings for sports clothes and gear that help improve the gear and possibly enhance the athlete's performance. Still, many scientists, engineers, and technologists believe they have only scratched the surface of nanotechnology's potential.
Nanotechnology is in its infancy, and no one can predict with accuracy what will result from the full flowering of the field over the next several decades. Many scientists believe it can be said with confidence, however, that nanotechnology will have a major impact on medicine and health care; energy production and conservation; environmental cleanup and protection; electronics, computers, and sensors, and world security and defense.
(Adapted from Encarta DVD 2009)