More and more residences, businesses, and even government agencies are using telephone answering machines to take messages or give information or instructions. Sometimes these machines give (1) instructions, or play messages that are difficult to understand. If you (2) telephone calls, you need to be ready to respond when you get a (3)
The most common machine is the (4) used in residence. If you call a home (5) there is a telephone answering machine (6) you will hear several rings and then a recorded message that (7) says something like this: "Hello. We can’t come to the (8) right now. If you want us to call you back, please leave your name and number after the beep." Then you will hear a "beep", (9) is a brief, high-pitched (10) . After the beep, you can say who you are, whom you want to speak to, and what number the person should call to (11) you, or you can leave a (12) . Some telephone answering machines record for only 20 or 30 seconds after the beep, (13) you must respond quickly.
Some large businesses and government agencies are using telephone answering machines to provide information on (14) about which they receive a large volume of (15) . Generally speaking, using these systems (16) you to have a touch-tone phone ( a phone with buttons rather than a rotary dial). The voice on the machine will tell you to (17) a certain button on your telephone if you want information on Topic A, another button for Topic B, and so on. You listen (18) you hear the topic you want to learn about, and then you push the (19) button. Immediately after making your (20) , you will hear a recorded message on the topic.
2（）
A．commands
B．requires
C．asks
D．requests
参考答案：B
解析：
词汇辨析题。根据原句可知此处表达的意思是：通常而言，使用这些系统要求使用者安装按键式电话(a touch-tone phone)。表示某项规章制度或条例的要求，应该用动词require。
[避错指导] command意为“命令，统帅”。ask、request这两个问都能表示“要求”，ask含有期望给以回答或做出反应的意思。当你觉得所要求的东西会得到时，或者不可能被拒绝时，最好用ask。request则比ask正式得多，当你觉得所要求的东西不会得到时，或者有可能被拒绝时，最好用request，因此这个词可以表达谦逊或者客气，如：Gentlemen are requested not to smoke．(先生们请勿吸烟。)与require不同的是，ask和request的主语通常是人，而require的主语可以是物，这里using these systems是物作主语，故排除ask及request。