TO 41IN THE FEW MINUTES THAT REMAIN OF TODAY'S CLASS. I'D...

Questions 38 to 41In the few minutes that remain of today's class. I'd like to discuss next week's schedule with you because I'm presenting a paper at a conference in Detroit on Thursday, I won't be here for either Wednesday's or Friday's class. I will however be here for Monday's. Next Friday, a week from today, is the midterm exam, marking the half way point in the semester. Prof. Andrews has agreed to administer the exam. In place of the usual Wednesday's class, I've arranged an optional review session. Since it is optional, attendance will not be taken. However attending the class would be a good idea for those worried about the midterm. So remember: Optional class next Wednesday; Midterm, Friday.38. What is the purpose of the talk?39. At what point during the semester does the talk take place?40. What did Prof. Andrews agree to do?41. What will occur at next Wednesday's class time?Question 42 to 46 Today's lecture we'll center on the prehistoric people of Nevada Desert. Now most of these prehistoric desert people moved across the countryside throughout the year. You might think that they're wandering aimlessly. Far from it, they actually followed the series of carefully planned moves.Where they moved depended on where food was available. Places where plants were ripening or fish were spawning. Now often when these people moved, they carried all their possessions on their backs. But if the journey was long, extra food and tools were sometimes stored in caves or beneath rocks. One of these caves is now an exciting archaeological site. Beyond its small opening is a huge underground grotto. Even though the cave is very large, it was certainly two dark and dusty for the crawlers to live in. But it was a great place to hide things. And tremendous amounts of food supplies and artifacts have been found there. The food includes dried fish seeds and nuts. The artifacts include stone spear points and knives. The spar points are actually rather small. Here is a picture of some that were found. You can see their size in relation to the hands holding them.42. What is the main subject of this talk?43. What point does the speaker make about the prehistoric people of the Nevada Desert?44. Why didn't the people live in the cave described by the speaker?45. What have archaeologists found in the cave?46. Why does the speaker show a photo to the class?Question 47 to 50To us, the environment in which fish dwell often seems cold, dark and mysterious. But there are advantages to living in water. And they've played an important role in making fish what they are. One is that water isn't subject to sudden temperature changes. Therefore it makes an excellent habitat for a cold blooded animal.Another advantage is the water's ability to easily support body weight. Protoplasm has approximately the same density as water. So a fish in water is almost weightless. This weightlessness in turn means two things:1) A fish can get along with a light weight and a simple bone structure. And 2) Limitations to a fish's size are practically removed. Yet there is one basic difficulty to living in water the fact that it is incompressible. For a fish to move through water, it must actually shove it aside. Most can do this by wiggling back and forth in snakelike motion. The fish pushes water aside by the forward motion of its head and with a curve of its body and its flexible tall. Next the water flows back along the fish's narrowing size, closing in at the tall and helping the fish propel itself forward. The fact that water is incompressible has literally shaped the development of fish. A flat and angular shape can be moved through water only with difficulty. And for this reason, fish have a basic shape that is beautifully adapted to deal with this peculiarity.47. What is the talk mainly about?48. What does the speaker mention as a problem that water presents to fish?49. The speaker compares a fish's movement with that of what creature?50. What aspect of a fish does the speaker discuss in the most detail?DAP AN 08 - 9DDBCC AAADB DBDDC ACAAC BCABC CBDAD DADAB CDCBA BDABC ADACBDBCDC CADDA BCABA BBADA DDCCB BABCB CABBD AADDBDBBDC BACDC BACDA DABAB DADAC DCABD ADCDB BDDAB BDBAD DABCD