单项选择题

Many types of rock are ______ from volcanoes as solid, fragmentary material.

A．ejected
B．injected
C．propelled
D．flung
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单项选择题
At the end of the passage the author proposes more work on_______.
A．the brain structure as a whole.
B．the functioning of part of the brain.
C．the distinction between the sexes.
D．the effects of the corpus callosum.
单项选择题
Commercial application of the research finding will be possible ff salad cream can be made resistant to bacterial attack ______
A．by varying its chemical composition
B．by turning it into a solid lump
C．while keeping its structure unchanged
D．while retaining its liquid form
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