Read policy commentary for purpose, detail, and action. Then compare each answer with exact evidence from the text.
市图书馆去年试行延长自习区开放时间，原本希望为下班较晚的读者提供更灵活的选择。调查显示，晚间使用人数确实增加了，但集中在考试季，平时部分区域的照明和管理成本明显高于预期。
因此，图书馆今年没有简单地取消延时服务，而是改为根据预约人数开放不同楼层。支持者认为这种办法兼顾了需求和成本；也有人担心，必须提前预约会给临时有需要的读者带来不便。图书馆表示将在三个月后再次评估，并公开使用数据。
Compare the original goal, mixed evidence, policy response, and remaining objection.
Answer before opening the explanation. The evidence tells you which relationship in the text controls the answer.
Use increased, but 集中在考试季 shows that the demand was seasonal.
The library will 根据预约人数开放不同楼层 rather than opening every area.
The concern is that advance booking may inconvenience 临时有需要的读者.