The passage implies that which of the following steps would be the first performed by explorers who wish to maximize their chances of discovering gold？
A．Surveying several sites known to have been formed more than two billion years ago
B．Limiting exploration to sites known to have been formed from metamorphic fluid.
C．Using an appropriate conceptual model to select a site for further exploration
D．Using geophysical methods to analyze rocks over a broad area
E．Limiting exploration to sites where alluvial gold has previously been found
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The author’s argument concerning the effect of the official sale of duplicate artifacts on illegal excavation is based on which of the following assumptions？
A．Prospective purchasers would prefer to buy authenticated artifacts.
B．The price of illegally excavated artifacts would rise.
C．Computers could be used to trace sold artifacts.
D．Illegal excavators would be forced to sell only duplicate artifacts.
E．Money gained from selling authenticated artifacts could be used to investigate and prosecute illegal excavators. -
According to the passage, the outbreak of dengue hemorrhagic fever in the 1950’s occurred for which of the following reasons？
A．The mosquito Aedes aegypti was newly introduced into Asia.
B．The mosquito Aedes aegypti became more numerous.
C．The mosquito Aedes albopictus became infected with the dengue virus.
D．Individuals who would normally acquire immunity to the dengue virus as infants were not infected until later in life.
E．More people began to visit and inhabit areas in which mosquitos live and breed. -
Brand R coffee costs $3. 25 per pound and brand T coffee costs $ 2. 50 per pound.
Column A Column B
The number of pounds of brand R in a 1. 2
mixture of brands R and T that costs
$3. 00 per pound
A．if the quantity in Column A is greater
B．if the quantity in Column B is greater
C．if the two quantity are equal
D．if the relationship cannot be determined from the information given -
In the year shown in which the median price of existing homes sold was closest to the median price of new homes sold, approximately how many million existing homes were sold？
A．1.2
B．1.6
C．2.0
D．2.4
E．2.8 -
Which of the following, if true, would most strengthen the author’s assertion about the cause of the Lyme disease outbreak in the United States？
A．The deer population was smaller in the late nineteenth century than in the mid-twentieth century.
B．Interest in outdoor recreation began to grow in the late nineteenth century.
C．In recent years the suburbs have stopped growing.
D．Outdoor recreation enthusiasts routinely take measures to protect themselves against Lyme disease.
E．Scientists have not yet developed a vaccine that can prevent Lyme disease.