Evidence obtained from observation and experiment is often used to ________ a scientific theory.
A．confirmB．claim
C．concludeD．calculate
A
解析　考查動(dòng)詞辨析。confirm證實(shí)；claim聲稱(chēng)，斷言；conclude得出結(jié)論；calculate計(jì)算，估計(jì)。句意為：由觀察和實(shí)驗(yàn)得出的證據(jù)通常被用來(lái)證實(shí)科學(xué)理論。故A項(xiàng)正確。
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