College librarian: Until three years ago, nonstudents
used the library without charge. Then, because of our
decreased budget, they were asked to pay $100 per year.
Nevertheless, about 150 nonstudents still use the library
without paying. We will therefore gain financially if we
hire a guard to identify nonstudents and ensure that they
have paid the fee.
　
Which of the following would it be most important to
know in order to evaluate the librarian s conclusion ?

The number of students who use the library annually.
The library s budget this year.
Whether the library has installed an expensive
　computerized cataloging system.
How much the library s budget was decreased three
　years ago.
The annual cost to the library of hiring a guard.

――――――――――――――――――――――――
答案：(E)

The first people to inhabit North America came from
Asia. Scientists had hypothesized that these people
traveled across a now-submerged landmass that connected
the two continents until 14,000 years ago, depending for
food only on the land animals they hunted as they traveled.
Recent discoveries have led to the new hypothesis that the
first people came by boat along the southern shore of the
landmass, eating fish and sea mammals.
　
Which of the following, if true, most strongly supports the new hypothesis
by casting doubt on the earlier hypothesis?

The landmass connecting North America and Asia extended
　very far to the north.
In Europe, maritime cultures primarily dependent on the
　sea for food developed no earlier than 10,000 years ago.
People living in Asia at the time the two continents
　were connected hunted land animals for food.
The landmass was so bitterly cold that its vegetation
　would have been too sparse to support land animals.
Sophisticated and mature cultures that display great
　similarities to each other existed as far back as 8,000
　years ago in North America and Asia.

――――――――――――――――――――――――
答案：(D)

A backpacker is choosing a route through a national park
that has six campsites―Quakerbridge, Rockside, Stonybrook,
Terraces, Underhill, and Vernon. The backpacker will spend
exactly four consecutive nights in the park, with one night
at Underhill and with one night each in three of the other
campsites. Any route is acceptable as long as it conforms
to the following conditions:
　
　If Quakerbridge is chosen, Rockside must also be chosen.
　Rockside and Terraces cannot both be chosen.
　Terraces cannot be chosen for the night that comes next
　　after the night spent at Underhill.
Which of the following is an acceptable sequence of
campsites, from first to last?
Quakerbridge, Rockside, Terraces, Underhill
Quakerbridge, Rockside, Vernon, Stonybrook
Quakerbridge, Rockside, Vernon, Underhill
Quakerbridge, Stonybrook, Terraces, Underhill
Stonybrook, Underhill, Terraces, Vernon

――――――――――――――――――――――――
答案：(C)

If Quakerbridge is chosen, which of the following
campsites CANNOT be among those chosen?
Rockside
Stonybrook
Terraces
Underhill
Vernon

――――――――――――――――――――――――
答案：(C)

If the third night is spent at Terraces, then the
second night must be spent at either
Quakerbridge or Vernon
Rockside or Stonybrook
Stonybrook or Vernon
Underhill or Stonybrook
Underhill or Vernon

――――――――――――――――――――――――
答案：(C)

Of the following decisions, which will allow the
backpacker to choose a route from the largest number
of acceptable campsite sequences that include both
Terraces and Underhill?
The first night will be spent at Terraces.