3题CR题目,求解释....

CR  
blue book   
P308/27.P310/31.P312/35        Answer:
ECC

27. Shipping Clerk: The five specially ordered
shipments sent out last week were sent out on Thursday. Last week, all of the
shipments that were sent out on Friday consisted entirely of building supplies,
and the shipping department then closed for the weekend. Four shipments were
sent to Truax Construction last week, only three of which consisted of building
supplies.

A. At least one of the shipments sent to Truax
Construction last week was specially ordered.

B. At least one of last week’s specially
ordered shipments did not consist of building supplies.

C. At least one of the shipments sent to
Truax Construction was not sent out on Thursday of last week.

D. At least one of the shipments that were sent out on
Friday of last week was sent to Truax Construction.

E. At least one of the shipments sent to
Truax Construction last week was sent out before Friday.

31. Two centuries ago, Tufe Peninsula became separated
from the mainland, isolating on the newly formed Tufe Island a population of
Turfil sunflowers. This population’s descendants grow to be, on average, 40
centimeters shorter than Turfil sunflowers found on the mainland. Tufe Island
is significantly drier than Tufe Peninsula was. So the current average height
of Tufe’s Turfil sunflowers is undoubtedly at least partially attributable to
changes in Tufe’s environmental conditions.

A. There are no types of vegetation on Tufe Island
that are known to benefit from dry conditions.

B. There were about as many
Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe
Island today.

C. The mainland’s environment has not changed in ways
that have resulted in Turfil sunflowers on the mainland growing to be
40centimeters taller than they did two centuries ago.

D. The oil on Tufe Island, unlike that on the
mainland, lacks important nutrients that help Turfil sunflowers survive and
grow tall in a dry environment.

E. The 40-centimeter height difference between the
Turfil sunflowers on Tufe Island and those on the mainland is the only
difference between the two populations.

35. The average hourly wage of television assemblers
in Vernland has long been significantly lower than that in neighboring Borodia.
Since Borodia dropped all tariffs on Vernlandian televisions three years ago,
the number of televisions sold annually in Borodia has not changed. However,
recent statistics show a drop in the number of television assemblers in
Borodia. Therefore, updated trade statistics will probably indicate that the
number of televisions Borodia imports annually from Vernland has increased.

   Which of the
following is an assumption on which the argument depends?

A. The number of television assemblers in Vernland has
increased by at least as much as the number of television assemblers in Borodia
has decreased.

B. Televisions assembled in Vernland have features
that televisions assembled in Borodia do not have.

C. The average number of hours it takes a Borodian
television assembler to assemble a television has not decreased significantly
during the past three years.

D. The number of televisions assembled annually in
Vernland has increased significantly during the past three years.

E. The difference between the hourly wage of
television assemblers in Vernland and the hourly wage of television assemblers
in Borodia is likely to decrease in the next few years.