For Questions 1 through 5, select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.
It comes as no surprise that different cultures have certain behavioral norms；however, to an outsider, the specifics of these behaviors can often be ______.
连接词“however”表明空格处的词语应该与前文“no surprise” 形成对比，选项中表达“surprise”含义的词只有startling和unexpected，因此选择B和D。derisive意思是“嘲笑的，嘲弄的”，不符合句意。句意是，“不同的文化有特定的行为规范，这不足为奇；然而，对于外人而言，这些行为规范的细节特征却往往是让人意想不到的。”