转运方便、污染小、可以避免交叉感染的采血法A．指尖采血法 B．耳垂采血法 C．动脉采

请将实验 “绿叶在光下制造有机物”中的各实验步骤与相对应的实验目的用直线连接起来。

第四部分读写任务 (共1小题，满分30分)

阅读下面的短文，然后按照要求写一篇150词左右的英语短文。

[阅读材料]

An elderly carpenter（木匠） was ready to retire．He told his employer of his plans to leave the house-building business and live a more leisurely life with his wife enjoying his extended family．He would miss the paycheck, but he needed to retire．They could get by．

The employer was sorry to see his good worker go and asked if he could build just one more house as a personal favor．The carpenter said yes, but in time it was easy to see that his heart was not in his work．He resorted to（采用） poor workmanship(工艺，手艺) and used inferior（低劣的） materials．It was an unfortunate way to end a dedicated career．

When the carpenter finished his work, the employer came to inspect the house．He handed the front-door key to the carpenter．"This is your house," he said, "my gift to you．"

The carpenter was shocked! What a shame! If he had only known he was building his own house, he would have done it all so differently．

[写作内容]

1．以约30个词概括短文的要点；

2．以约120个词在这个故事内容的基础上展开讨论并包括以下内容：

（1）    今天的付出和明天的收获之间的关系；

（2）    构筑房屋和构建生活之间的关系；

（3）    对你的议论进行总结。

[写作要求]

1.   作文中可使用自己的亲身经历或虚构的故事，也可以参照阅读材料的内容，

但不得直接原文抄袭。

2.   题目自拟。

[评分标准]          概括准确，语言规范，内容合适，篇章连贯。

序列的付氏变换是（）的周期函数，周期为（）。

A.时间；T

B.频率；π

C.时间；2T

D.角频率；2π

公安部在PGIS平台软件开发与管理上要求有以下几方面（）

A.统一开发

B.统一版本管理

C.统一发布

D.统一审批下载

假设同一时间，香港的外汇市场报价为1美元=7.7346～7.7368港元，纽约外汇市场的报价为1美元=7.7528～7.7578港元，如果以100万美元进行套汇交易，可以获利多少