改革开放以来，我国的社会结构发生了显著的分化，以()为基础的新社会阶层分化机制逐渐取代过去以政治身份、户口身份和行政身份为依据的分化机制。
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The example of a lahar from the Nevada del Ruiz volcano in 1985 is used to show that
A. acoustic flow monitors are effective in predicting lahars.
B. acoustic flow monitors are used all around the world.
C. acoustic flow monitors can completely prevent lahars.
D. acoustic flow monitors are sensitive to higher frequencies.
“哈勃定律”揭示：对于我们地球观测点来说，离我们越遥远的星体远离我们而退行的速度越快，即星体背离地球逃离的速度与其距地球的远近成()。
下列程序段的语法是正确的。Ifx>0Thenx=x+2Elsex=x-2EndIf。()
It can be inferred from the passage that George Washington was probably the person who
A. was welcomed by the talk show coordinator.
B. could attract more audience because he was in the hearts of his countrymen.
C. was cautious of his words and could not fill the room with sounds.
D. had the qualities of wit, eloquence, brilliance, and insight.
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