若函数f（x）的定义域是[-1，0]，则函数f（sinx）的定义域是（ _爱下问搜题

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问题选择题

若函数f（x）的定义域是[-1，0]，则函数f（sinx）的定义域是（　　）

A．[-1，0]

B．[2kπ-

π

2

，2kπ]，k∈Z

C．[（2k-1）π，2kπ]，k∈Z

D．[2kπ，2kπ+π]，k∈Z

答案

∵函数f（x）的定义域是[-1，0]，∴-1≤sinx≤0，∴2kπ-π≤x≤2kπ（k∈Z）

故选C．

填空题

最早开始对计算机编目进行可行性研究的是______。

完形填空

To celebrate the end of our exams, my friends and I went to a fast food restaurant.We__26__hamburgers and Coca Cola at the counter. When our__27__came,I started walking towards an empty table. By bad luck, my purse strap (带子) got__28__on a chair and the tray (托盘) that I was holding slipped__29___my hands and went flying in the air. The tray, and its contents,__30___on a man who was just about to__31___a bite of his sandwich. I stared,greatly___32__,as the drinks soaked (浸湿) his white shirt.
Then I___33__my eyes and prepared myself for his burst of__34__.Instead,he said “It’s OK” to_ 35__me before he disappeared into the washroom.
Still shaky and unsure___36__to do next, my friends and I went to a table and sat there, trying our best to look___37__.A moment later, the man came out of the washroom and___38__our table, my heart almost stopped
___39__.I thought he was going to ask for my father’s_ 40 __and call him.
　　To my surprise, he merely smiled at us, handed us some cash and said,“__41___yourself new hamburgers. ”He then walked_ 42___without even finishing his food.
　　He could have made what was already an uncomfortable situation worse,___43__he chose a different way and gave us a reason to believe that there is still__44___in this world. I will never___45__his actions.

A．discouraged

B．disappointed