单项选择题

Surprisingly to those who view the ocean floor as a uniformly ______ waste, each vent in the floor, where seawater is heated by the earth's inte-rior magma, has been found to be an island-like ______ with its own distinctive fauna.

A． teeming...habitat
B． lifeless...enclave
C． barren...oasis
D． sunken...grotto
E． hazardous...environment
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单项选择题
According to the passage, all of the following were true of the center of the atom EXCEPT that it
A． had not yet been seen by the naked eye
B． contained elements that were positively charged
C． was very little larger than a molecule
D． followed experimentally determinable processes
E． was smaller than 1/125 millionth of an inch
单项选择题
Which of the following relationships most closely parallels the relationship between the proton and the electrons described in the passage
A． A hawk to its prey
B． A blueprint to a framework
C． A planet to its satellites
D． A magnet to iron filings
E． A compound to its elements
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