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8月8日

Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole.

Ø         Barbara McClintock’s systematic examination of corn demonstrated the transposition of genes, a finding that overturned entrenched beliefs and proved that ------- study may produce brilliant insights and ------- change.

A.      haphazard . . radical

B.      inherent . . controversial

C.      improvised . . startling

D.      methodical . . revolutionary

E.      derivative . . gradual

Ø         Read the following SAT test question, then click on a button to select your answer.

Note: Figure not drawn to scale.

The circle shown above has center O and a radius of length 5. If the area of the shaded region is 20 东方育才/LOCALS~1/Temp/msoclip1/01/clip_image002.gif">, what is the value of x?

A.      18

B.      36

C.      45

D.      54

E.      72

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