单项选择题

Australia began to assume its modern configuration by the Eocene Epoch, some 50 million years ago, when Antarctica broke away and drifted southward.

A．status
B．sphere
C．shape
D．situation
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单项选择题
Education in Russia and the other new countries faces especially daunting obstacles because the struggling economies of these nations often provide insufficient funds for education.
A．stunning
B．discouraging
C．concerning
D．prevailing
单项选择题
Not until the advent of histochemistry could the anatomist see through the microscope ceils which carry specific enzymes or gauge how active these enzymes are in different ceils under various conditions.
A．discern
B．grasp
C．measure
D．estimate
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