The bias blind spot can prompt a scientist to______.
A. overemphazise the value of experiments
B. refuse to accept the failure of his experiments
C. discard some valuable data
D. disbelieve data collected by others
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According to the passage, which factor might cause the population of a species to decrease
A favorable amount of light and water
B. An ability to hide from or defend against predators
C. A large number of other species competing for food
D. A greater number of births than deaths
Which of the following plays least in fixing the public sector？
A. Weakening the strikers' power.
B. Restricting unions' legal rights.
C. Reducing public-sector pay deals.
D. Making small productivity gains.
According to the passage, a child who is capable of concrete operations can
A. perform. tasks that may confuse an adult
B. install an extra card on a computer
C. make two rows of coins look the same
D. reason systematically about quantity and space
It can be inferred from Paragraph 2 that______.
A. public-sector unions have been acting stealthily
B. the income in the public sector is indirectly augmented
C. public-sector unions have taken precedence over politicians
D. public-sector unions will fight against government reorganization
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