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单项选择题

The study of the end-Permian mass extinction is hindered by all of the following EXCEPT ______.

A．the lack of experienced researchers
B．lack of access to southern China
C．lack of relevant rock samples
D．lack of well-preserved fossils

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热门试题

单项选择题We can conclude from the passage that ______.

A．there is a consensus about the causes of the end-Permian mass extinction
B．man would not have existed without the end-Permian mass extinction
C．insects are more adaptable in coping with natural devastations
D．natural catastrophes must have hindered the evolution of life

单项选择题The author implies that ______.

A．social agencies in America can be very helpful
B．the help to American families from social agencies is limited
C．the government should do more to improve patchwork programs
D．the fragmentary nature 6f the American family is unique

单项选择题What is said to be the major problem facing young couples

A．They need to fulfill more duties.
B．They are incapable of balancing the budget.
C．They have their children spoiled and overindulged.
D．They get empty-handed after divorc

单项选择题According to the author, when young families are isolated, ______.

A．old people can easily accept the change
B．people can move from place to place
C．individuals can hardly become innovative
D．economy develops at high speed

单项选择题According to the author, the concept of aggression ______.

A．is hard to define because it has been used by various disciplines
B．covers both deplorable and necessary behaviors
C．should be dropped altogether
D．should be better expressed by a different term