A、The building with the log shape. B、The traditional log cabin. C、The senior homes with logs. D、The blocking beams and walls. B

M：As we probably know, log structures are gaining popularity. We can find those structures around the countryside.
W：Actually, log structures are no longer just the simple country homes that we think of as the traditional log cabin. Some senior homes now incorporate natural round logs in blocking beams and walls.
M：People seem to think that the round logs give their homes a pleasant warm atmosphere.
W：Yes, and even people who want to build a traditional log cabin on their own can buy equipment with precut logs that fit together like pieces of puzzle.
M：Before showing us some slides of modern log houses, would you like to give us a little historical background on the subject?
W：Of course, I would like to. Log cabins were first built in the late 1600s along the Delaware River Valley. The European immigrants who settled there brought centuries’ old traditions of working with logs.
M：In that heavily wooded area logs were the material in hand.
W：Log cabins were the most popular in the early 1800s with the settlers who were moving west. They provided the answer to the pioneers’ need for a sale and sliding boards for windows.
M：Actually, these log buildings can meet the demands of different kinds of people.
W：Well, the log buildings that have probably most influence on modern architects are those of the mountain retreats of wealthy New Yorkers. These country houses which were popular in the early 1900s represent what’s known as the modern style.
M：Thank you for your description. Now let’s look at those slides.
5. What did the log structures refer to originally?
6. Where did the log cabins appear first?
7. Why did the early immigrants build houses with logs in Delaware?
8. What are the two speakers going to do next?