Questions 1-12
Before the 1500's, the western plains of North America were dominated by farmers.
One group, the Mandans, lived in the upper Missouri River country, primarily in
present-day North Dakota. They had large villages of houses built close together. The
Line tight arrangement enabled the Mandans to protect themselves more easily from the
(5) attacks of others who might seek to obtain some of the food these highly capable
farmers stored from one year to the next.
The women had primary responsibility for the fields. They had to excercise
considerable skill to produce the desired results, for their northern location meant
fleeting growing seasons. Winter often lingered ; autumn could be ushered in by
(10) severe frost. For good measure, during the spring and summer, drought, heat, hail,
grasshoppers, and other frustrations might await the wary grower.
Under such conditions, Mandan women had to grow maize capable of weathering
adversity. They began as early as it appeared feasible to do so in the spring, clearing
the land, using fire to clear stubble from the fields and then planting. From this point
(15) until the first green corn could be harvested, the crop required labor and vigilance.
Harvesting proceeded in two stages. In August the Mandans picked a smaller
amount of the crop before it had matured fully. This green corn was boiled, dried, and
shelled, with some of the maize slated for immediate consumption and the rest stored
in animal-skin bags. Later in the fall, the people picked the rest of the corn. They saved
(20) the best of the harvest for seeds or for trade, with the remainder eaten right away or
stored for later use in underground reserves. With appropriate banking of the extra
food, the Mandans protected themselves against the disaster of crop failure and
accompanying hunger.
The women planted another staple, squash, about the first of June, and harvested it
(25) near the time of the green corn harvest. After they picked it, they sliced it, dried it, and
strung the slices before they stored them. Once again, they saved the seed from the best
of the year's crop. The Mandans also grew sunflowers and tobacco ; the latter was the
particular task of the older men.
1. What is the main topic of the passage ?
(A) The agricultural activities of a North American Society
(B) Various ways corn can be used
(C) The problems encountered by farmers who specialize in growing one crop
(A) Weather conditions on the western plains
2. The Mandans built their houses close together in order to
(A) guard their supplies of food
(B) protect themselves against the weather
(C) allow more room for growing corn
(A) share farming implements
3. The word "enabled" in line 4 is closest in meaning to
(A) covered
(B) reminded
(C) helped
(A) isolated
4. The word "considerable" in line 8 is closest in meaning to
(A) planning (B) much
(C) physical (A) new
5. Why does the author believe that the Mandans were skilled farmers ?
(A) They developed effective fertilizers.
(B) They developed new varieties of corn.
(C) They could grow crops in most types of soil.
(A) They could grow crops despite adverse weather.
6. The word "consumption" in line 18 is closest in meaning to
(A) decay (B) planting
(C) eating (A) conversion
7. Which of the following processes does the author imply was done by both
men and women ?
(A) Clearing fields
(B) Planting corn
(C) Harvesting corn
(A) Harvesting squash
8. The word "disaster" in line 22 is closest in meaning to
(A) control
(B) catastrophe
(C) avoidance
(A) history
9. According to the passage, the Mandans preserved their food by
(A) smoking
(B) drying
(C) freezing
(A) salting
10. The word "it" in line 25 refers to
(A) June
(B) corn
(C) time
(A) squash
11. Which of the following crops was cultivated primarily by men ?
(A) Corn
(B) Squash
(C) Sunflower
(A) Tobacco
12. Throughout the passage, the author implies that the Mandans
(A) planned for the future
(B) valued individuality
(C) were open to strangers
(A) were very adventurous
Questions 13-21
The elements other than hydrogen and helium exist in such small quantities that it is
accurate to say that the universe is somewhat more than 25 percent helium by weight
and somewhat less than 75 percent hydrogen.
Line Astronomers have measured the abundance of helium throughout our galaxy and in
(5) other galaxies as well. Helium has been found in old stars, in relatively young ones, in
interstellar gas, and in the distant objects known as quasars. Helium nuclei have also
been found to be constituents of cosmic rays that fall on the earth (cosmic "rays" are
not really a form of radiation; they consist of rapidly moving particles of numerous
different kinds). It doesn't seem to make very much difference where the helium is
(10) found. Its relative abundance never seems to vary much. In some places, there may be
slightly more of it ; in others, slightly less, but the ratio of helium to hydrogen nuclei
always remains about the same.
Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium
are responsible for most of the energy that stars produce. However, the amount of
(15) helium that could have been produced in this manner can be calculated, and it turns out
to be no more than a few percent. The universe has not existed long enough for this
figure to be significantly greater. Consequently, if the universe is somewhat more than
25 percent helium now, then it must have been about 25 percent helium at a time near
the beginning.
(20) However, when the universe was less than one minute old, no helium could have
existed. Calculations indicate that before this time temperatures were too high and
particles of matter were moving around much too rapidly. It was only after the one-
minute point that helium could exist. By this time, the universe had cooled so sufficiently
that neutrons and protons could stick together. But the nuclear reactions that led to the
(25) formations of helium went on for only relatively short time. By the time the universe
was a few minutes old, helium production had effectively ceased.
13. What does the passage mainly explain ?
(A) How stars produce energy
(B) The difference between helium and hydrogen
(C) When most of the helium in the universe was formed
(D) Why hydrogen is abundant
14. According to the passage, helium is
(A) the second-most abundant element in the universe
(B) difficult to detect
(C) the oldest element in the universe
(D) the most preval!!!!!ent element in quasars
15. The word "constituents" in line 7 is closest in meaning to