Invention can be ________ as it may suddenly begin just by noticing something usual.
A．a(chǎn)ccidentalB．careless
C．necessaryD．imaginative
A
A 考察形容詞辨析。Accidental偶然的，careless粗心的；necessary必要的；imaginative虛構(gòu)的，富于想象的；根據(jù)suddenly可知A正確。句意：發(fā)明有時也是偶然的，因為它僅僅開始于注意到了某個平常的某個東西。故A正確。
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