单项选择题

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A． sock: hand
B． fringe: ankle
C． ring: wrist
D． epaulet: shoulder
E． tie: bust
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单项选择题
The passage suggests which of the following about the hypothetical discovery of an absence of seasonal variations in oxygen 18 moleculesⅠ. It would not prove that certain dinosaurs were capable of regulating their temperatures internally.Ⅱ. One likely source of such a discovery would come from annual growth bands of dinosaur teeth.Ⅲ. The fact that no biotechnology yet exists to elucidate thermoregulation biochemistry proves such a discovery is impossible.Ⅳ. The discovery would be profound, because oxygen 18 is only found in fossil records where there is seasonal variation.
A． Ⅰ and Ⅱ only
B． Ⅱ and Ⅲ only
C． Ⅲ and Ⅳ only
D． Ⅰand Ⅳ only
E． Ⅱ, Ⅲ, and Ⅳ only
单项选择题
It can be inferred from the passage that which of the following would occur if the chimneys formed by superbubbles failed to deliver their hot interior gasⅠ. The surrounding galaxy would lack enough cool gas clouds to form new stars.Ⅱ. Positive feedback in the star formation process would go unchecked.Ⅲ. More and more O-type stars would come into existence from the static gas clouds.
A． Ⅰonly
B． Ⅱ only
C． Ⅰand Ⅱ only
D． Ⅰand Ⅲ only
E． Ⅰ, Ⅱ and Ⅲ
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