Q43. What is the talk mainly about?
Q44. According to the speaker, why was it a problem for mail carriers to cross rivers in 1600s?
Q45. What does the expression the "age of the iron horse" refer to?
Q46. What can be found in the museum's philatelic collection?

Q47-50 The beginning of a talk on astronomy.
Most people think of astronomers² as people who spend their time in cold observatories³ peering through telescopes every night. In fact a typical astronomer¹ spends most of his/her time analyzing⁴ data and may only be at the telescope a few weeks of the year. Some astronomers work on purely⁵ theoretical problems and never use a telescope at all. You might not know how rarely images are view directly through telescopes. The most common way to observe the skies is to photograph them. The process is very simple. First a photographic plate is coated with a light-sensitive material. The plate is positioned so that the image received by the telescope is recorded on it. Then the image can be developed, enlarged and published so that many people can study it. Because most astronomical⁶ objects are very remote the light we receive from them is rather feeble. But by using a telescope as a camera, long time exposures can be made. In this way objects can be photographed that are a hundred times too faint to be seen by just looking through a telescope.
Q47. According to the speaker, what do people often think about astronomers?
Q48. What is one advantage of photographing the skies?
Q49. Why do astronomers often use photographic plate?
Q50. What is one reason astronomers make long time exposures?

Key: BCB ADCDB ABCDA DBBDD BBCBA ADBCD BABCD ADBDA CACDB

Part 2
1. (A) Each person will be allowed to buy only one ticket.
(B) The tickets will sell out quickly.
(C) The rock concert will probably be rescheduled.
(D) There will be extra tickets at the rock concert.

2. (A) Board the train.
(B) Send a fax.
(C) Change his departure time.
(D) Have breakfast.

3. (A) The woman should cut his hair again.
(B) He wants the woman to cut his hair extremely short.
(C) He's bald and doesn't need a haircut.
(D) The woman previously⁷ cut off too much of his hair.
4. (A) The manager took the man's keys.
(B) The man has too many keys.
(C) The man often misplaces his keys.
(D) The same thing happened to her.

5. (A) She has to practice her speech.
(B) She doesn't like seafood⁸.
(C) She thinks the restaurant is too expensive.
(D) She will accompany the man to the restaurant.

6. (A) Try to find out who the wallet belongs to.
(B) Keep the wallet until someone comes looking for it.
(C) Leave the wallet where she found it.
(D) Get the attention of the person who dropped the wallet.

7. (A) The program begins on Sunday.
(B) He'll meet the woman on Saturday.
(C) They could watch the program on Sunday.
(D) His cousin arrives on Sunday.

8. (A) She can't help the man look for another platter.
(B) She forgot the platter had been broken.
(C) She didn't realize the platter had been broken.
(D) She doesn't want the man to replace the platter.

9. (A) The woman can take a bus to the museum.
(B) The woman should wait in front of the museum.
(C) He doesn't know where the museum is.
(D) There's only one bus that travels down Main Street.

10. (A) She'd like to take a later flight.
(B) They should leave for the airport immediately.
(C) They won't arrive late.
(D) She isn't afraid to travel alone.

11. (A) Look for owls¹⁰ with the man.
(B) Meet the man at the owl⁹ exhibit.
(C) Call the radio station.
(D) Listen to the broadcast.

12. (A) There is a charge for overdue¹¹ materials.