题目内容：

D

Ms．Rossi owns the Roadside Motel（汽车游客旅馆），which has 50 units．She wishes to keep a handy record of the number of units occupied（占用）．To do this she uses a calendar and writes the number of units occupied in a small box in the right-hand square of each date．The following questions are based on the occupancy rate（率） for July．

1.The total number of units occupied during the week of July 14 through July 20 was ______．

A．234           B．239            C．240             D．244

2.The average（平均） occupancy rate for Thursday was ________．

A．29            B．31             C．27               D．28

3.Ms．Rossi regards a 90% occupancy rate as excellent．On how many days during the month did the Roadside Motel have a 90% or better rate of occupancy?

A．6．           B．5．           C．4．           D．1．