Newton ________ weight (重力) .


  1. A.
    discover
  2. B.
    discovered
  3. C.
    found
  4. D.
    invented
B
解析：根據(jù)題意，牛頓發(fā)現(xiàn)了重力，要用一般過去時態(tài)，此項屬于科學(xué)方面的發(fā)現(xiàn)，用discover。故選B。
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