They knocked me around and I blacked _____, then they must have locked me up in here.

阅读下面的文章，根据文章内容，完成相应的选择题。

DOOR-KNOCKING

Door-knocking is the most effective way of making face-to-face community contact, but it has become a lost art. With the recent focus on customer privacy, door-knocking seems like an intrusion into other people's lives. But those who try it for the first time are usually surprised by the pleasant reception they receive. Here are some suggestions that will help you promote your services face-toface.

BEFORE YOU GO OUT

◆ BEGIN WITH A DOOR HANGER

Try leaving a door hanger two days before you go door-knocking. It should briefly describe the project and say that someone will be around in person.

◆ WEAR AN OFFICIAL NAME TAG

Door-knockers should wear name tags with the logo of their organization. The best name tags will also include a color photo and the name of the caller.

◆ HAVE PEOPLE KNOCK THEIR OWN BLOCKS

The easiest way to do door-knocking is to try your local area first. Being a neighbor creates an immediate connection with the person answering the door; after that, everything else is easy.

◆ FIND A GOOD EXCUSE TO DOOR-KNOCK

A short survey about local concerns or a current project is a good excuse. Figure out responses for various situations. What if the person who answers the door cannot speak English？ What if a child answers the door？

WHEN YOU GO OUT

◆ WHEN TO GO AND WHAT TO DO FIRST

The best times to knock are usually Saturdays. On other days, after dinner is ideal. When someone answers the door, smile and introduce yourself; say you are a volunteer and, if it helps, state where you live. Give the name of your organization and, briefly, the reason for the visit.

◆ STATE WHAT ACTION THE OTHER PERSON SHOULD TAKE AND THE BENEFITS

Tell the person what they need to do and how their actions will benefit themselves and others. If a person hesitates, emphasize benefits you've already mentioned and then, if necessary, add further benefits. If a person agrees, follow up immediately. If possible, get a donation, a signature, or a promise.

◆ RECORD CONTACT INFORMATION ON THE SPOT

Record names, addresses, e-mail addresses, phone numbers, and responses to questions on the spot. You won't remember them later!

操作提示：通过题干后的下拉框选择题目的正确答案。

1. Why does the author say that door-knocking has become a lost art？ {A; B; C}

A. It is not effective, no one will take this method any more.

B. People focus on privacy increasingly, so door-knocking seems like an intrusion into other people's lives

C. It is very difficult to do door-knocking，no one knows how to do it now.

2. Which step should be firstly taken when you try door-knocking？ {A; B; C}

A. Find a good excuse to door-knock

B. Wear an official name tag

C. Leave a door hanger

3. What does the underlined phrase “on the spot” mean？ {A; B; C}

A. without delay

B. at some place

C. in a difficult situation

4. Which time is not appropriate for door knocking？ {A; B; C}

A. Saturday afternoon.

B. Monday morning.

C. Thursday evening.

5. Who will receive pleasant reception when they try door-knocking？ {A; B; C}

A. A stranger who is not living in this community and gives no notice for his/her visit.

B. An offensive acquaintance who comes at any time.

C. A neighbor who does good preparation and has significant project to introduce.

A、GPIO是通用功能输入输出的缩写，基本都是用于芯片与片外器件或设备的交互。

B、可以独立控制每个GPIO的输入输出方向和输出状态。

C、所有GPIO端口都具有中断能力。

D、可以用GPIO来模拟各种接口方式，比如I2C总线或SPI接口。

A、PxDIR（输入输出方向寄存器）

B、PxIN（输入寄存器）

C、PxOUT（输出寄存器）

D、PxSEL（功能选择寄存器）

A、IO口初始化

B、按键防抖

C、按键的松开判定

D、按键电平读取