1．(2019·常州模拟)—Why not turn to Kevin? He saw what happened, so his word is the only ________ account.
—The problem is that he has refused to say anything about the accident.
A．tentative B．controversial
C．authentic D．arbitrary
解析：选C 上句句意：为什么不求助于Kevin？他目击了事件的发生，因此他所说的话是唯一真实准确的叙述。authentic“真实的，准确的”，符合语境。tentative“试探性的”；controversial“有争议的”；arbitrary“随意的，任性的”。
2．(2019·苏州模拟)The vase was quite ________ so we had to wrap it in soft material before we send it by post.
A．fragile B．flexible
C．fragrant D．false
解析：选A 句意：这个花瓶特别脆弱，所以邮寄的时候我们要用软的材料把它包裹好。fragile“脆弱的，易碎的”，符合语境。flexible“灵活的”；fragrant“芳香的”；false“错误的”。
