单项选择题

SQUALID:

A． immaculate
B． irrelevant
C． ornate
D． plentiful
E． tepid

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单项选择题

A． hidden emotion
B． refined reminiscence
C． constant curiosity
D． amazing skill
E． established affection

单项选择题

According to the passage, the more superbubbles that exist in a galaxy,

A． the longer the star-formation process will take place
B． the greater the amount of interstellar gas in the galaxy
C． the higher the positive feedback rate of star formation in the galaxy
D． the less magnetic activity in that galaxy
E． the more regular the intervals of star formation

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