169. Although knives and forks ________ prehistoric origin, spoons are relatively new.
a. are
b. they are
c. are they
d. which are
170. Neptune’s ________ the planet in the direction opposite to the other seven moons.
a. moon Triton orbiting
b. moon Triton orbits
c. moon Triton in orbit
d. moon is in Triton’s orbit
171. A dip pen’s nib is split into two halves ________ at the point of the nib.
a. who meet
b. which meet
c. they meet
d. meet
- In 1785, Henry Knox was appoint the new republic’s first secretary of war.
- Biophysics is one of the various branch of physics.
- Unlike many great writers, Longfellow was an enormously popular poet in him day.
- After Lincoln’s assassination, Ford’s Theater was closed and parts of it was converted to government office space.
- Most of the Earth’s ice is found either in the two great ice caps of Antarctica and Greenland and on the tall mountains of the world.
- Except for a few species, such as the spotted salamander, the courtship of salamanders are secretive and not often observed.
- Unlike most mollusks, crustaceans outgrow their shells and need to build several completely new casings throughout they lives.
- Sounds quieter than 10 decibels are impossibly for the human ear to hear.
- Often the best farmland is next to a river that floods periodical.
- The planet Mercury has a moderately elliptically orbit.
- An eighteen-watt fluorescent bulb seems as brightly as a seventy-five-watt incandescent bulb.
- The telephone works by changing the voice’s sound waves into electrically signals.
- In the Northern United States, two European species of small white birch are extensive planted as ornamentals.
- Fifty million Americans continue to smoke despite abundant evidence that smoking is extremely unhealthfully.
- The U.S. Military Academy sits on scenic heights overlooking a strategically bend in the Hudson River.
- The Erie Canal became so successfully at providing cheap transportation that it was greatly enlarged between 1835 and 1862.
- The Infra-Red Astronomy Satellite (IRAS), launched in 1983, contained a special coded reflecting telescope that detected infrared rays.
