题目内容
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What could astronomers better estimate once they knew what nebulae really were？
A．The diameter of variable stars
B．The density of cosmic dust
C．The size of the universe
D．The average number of planets in a galaxy
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更多“What could astronomers better …”相关的问题
A．People could choose to watch what they want.
B．People could be well-informed staying at home.
C．People could actually see the people and places talked about.
D．Television news came to people more quickly than radio news.
What happened to Senator Stems could happen to ______.
A．other old men
B．other senators
C．other politicians
D．anyone in the United States
He ate what he could, and gave the ______ of the food to the birds.
A．remain
B．uneaten
C．rest
D．part
A．People could choose to watch what they want.
B．People could be well informed staying at home.
C．People could actually see the people and places talked about.
D．Television news came to people more quickly than radio news.
A.brought；to
B.brought；on
C.brought；about
D.brought；forward
What could he do ______ what he had said？
A．was to take back
B．but to take back
C．but take back
D．was take back
What could the two speakers be？
A．PE coaches.
B．Sports fans.
C．Sports experts.
D．Sports businessmen.
What is the oxidation state of iron in pyrites, FeS2？ Is the anion diatomic？ What physical measurements could be performed to test this hypothesis？
