直接式问候适用于正式的交往场合，特别是在初次见面的社交场合，如：“您好”、“大家好”

应收与应付账款科目是往来科目，而预收和预付账款不是往来科目。

某天，北京的最高气温是零下5℃，记作（    ）℃；哈尔滨的最高气温是零下10℃，记作（    ）℃；（    ）的气温高。

Passage Four

Why haven’t British government bodies initiated any studies

A．Because they do not take the problem of sleepy drivers on motorways as of great significance.

B．Because they have not been aware of the seriousness of the problem of sleepy drivers.

C．Because they have no figures on the number of accidents caused by drivers’ sleepiness.

D．Because they plan to support relevant researches or a general study on "driver behaviour".

论述适度规模，合理规模和最佳规模理论及其所适用的城市？