一个快钟每小时比标准时间快1分钟，一个慢钟每小时比标准时间慢3_爱下问搜题

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问题单项选择题

一个快钟每小时比标准时间快1分钟，一个慢钟每小时比标准时间慢3分钟。如将两个钟同时调到标准时间，结果在24小时内，快钟显示10点整时，慢钟恰好显示9点整。则此时的标准时间是，

A．9点15分

B．9点30分

C．9点35分

D．9点45分

答案

参考答案：D

解析：使用代入法，设经历了x个小时，标准时间为Y，那么10 -x=y，9+3x＝y，将选项代入，即可得出结论，答案选D。

选择题

— Who ____________ Ben and Tim?

— They ____________ my classmates.[ ]

A. is; is

B. is; are

C. are; are

D. are; is

单项选择题

A (71) is a data type whose major attributes are determined by the roles governing the insertion and deletion of its elements. The only element that can be deleted or removed is the one that was inserted most (72) . Such a structure is said to have a last-in/first-out (LIFO) behavior, or protocol.

A．quickly

B．recentness

C．recently

D．fast