问题
选择题
Evidence obtained from observation and experiment is often used to ________ a scientific theory.
A．confirm
B．claim
C．conclude
D．calculate
答案
答案：A
解析 考查动词辨析。confirm证实；claim声称，断言；conclude得出结论；calculate计算，估计。句意为：由观察和实验得出的证据通常被用来证实科学理论。故A项正确。