A、Partially included. B、Already covered. C、Partially stamped. D、Already excluded. B在谈到邮资的问题上，女士说到，邮局会出售挂号信封，且这些信封已经包含了first-clas

M: What can we send if we use registered post?
W: Any first-class letter or packet except airway letter or railway letter.
M: How do we post? I mean what should we do?
W: Well, you should make sure that the packet is made up in a strong cover and then, it is fastened with wax, gum or other adhesive substance. Hand the packet to the post office counter clerk together with the cost of postage and the registration fee. Do not post it in the posting box. Make sure that the fee paid is adequate to cover the value of the contents. The counter clerk will give you a certificate of posting which he has initiated with the date stamped.
M: Is there any special security for the registered post?
W: Yes. A11 registered mail receives special security treatment. Packing is very important because registration is not in itself a safeguard against damage. The contents of registered packets must be adequately packed.
M: How do we pack them? Do we have to use special envelopes?
W: Yes, you have to send the articles in one of the registered letter envelopes sold by the post office. These envelopes are already stamped for first-class postage and have the minimum registration fee.
M: What about the compensation?
W: Compensation will not be paid for the following articles, such as bank notes, currency notes, trading stamps, coupons and some valuable things unless they are enclosed in one of the registered letter envelopes sold by the post office.
M: I see. How does it deliver?
W: The recipient on delivery signs for your registered mail. The post office does not undertake to deliver registered or any other mail to the addressee in person, but to the address shown. You can obtain confirmation of delivery by paying an additional fee, and completing an Advice of Delivery Form either at the time of posting or later. If you require the recipient’s signature on the Advice of Delivery, the form must be handed in at the time of posting otherwise a post office official will sign the certificate. The advice of delivery fee is lower if the form is handed in at the time of posting.
M: Thank you very much for all this useful information.
6. What is a requirement for sending a registered post?
7. What do we know about the special security for the registered post?
8. According to the conversation, what do we know about first-class postage?
9. According to Sarah, what are included in the compensation of the registered post?
10. Which is correct about recorded delivery and registered post?