Rapid application development (RAD) systems purport to lighten the developer’s (46) by making it easy to program an application with simple intuitive steps.
RAD tools (47) the developer everything needed to construct a fully functional application quickly and easily. They make short work of modifying the developed product to (48) changes after the program is finished. Applications developed with RAD tools are constructed as they are envisioned. As an application’s real usefulness (49) , the developer armed with RAD tools should be able to (50) on new features with little fuss.

A. beat B. change C. debug D. tack

患者李某，女性，70岁。患者反复咳喘三十余年，近一周加重。现症见：喘咳气涌，胸部胀痛，痰多质黏色黄或夹有血色，伴胸中烦闷，身热，体温37.5℃，有汗，口渴而喜冷饮，面赤，咽干，小便赤涩，大便或秘，舌质红，舌苔薄黄或腻，脉滑数。

若患者查体可见：胸部过度膨隆，呈桶状胸，叩诊呈过清音，听诊双肺底可闻及干、湿啰音。行肺功能检测为FEV₁／FVC：67%，FEV₁%预计值：71%，可诊断为（）

A.慢性阻塞性肺疾病重度

B.慢性阻塞性肺疾病轻度

C.慢性阻塞性肺疾病中度

D.慢性阻塞性肺疾病极重度

E.慢性支气管炎