If you ask some people: "How did you learn English so well?" you may get a surprising answer: "In my
sleep!"
       These are people who have taken part in one of the recent experiments to test learn-while-you-sleep
methods, which are now being tried in several countries, and with several subjects, of which English is only
one.
        Specialists say that this sleep-study method speeds language learning greatly. They say that the average
(平均) person can learn two or three times as much during sleep as in the same period during the day — and
this does not affect his rest in any way. A word of warning, however, sleep-teaching will only force your head
to learn what you have studied already while you are awake.
        In one experiment, ten lessons were broadcast over the radio continually for two weeks. Each lesson
lasted twelve hours — from 8 p.m. to 8 a.m. . The first three hours of English grammar and vocabulary were
given with the student awake. At 11 p.m. a sleep song was broadcast to send the student to sleep and for the
next three hours the radio whispered the lesson again into his sleeping ears. At 2 a.m. a sharp noise was sent
over the radio to wake the sleeping student up for a few minutes to review the lesson. Then soft songs went
him back to rest again while the radio went on. At 5 o'clock his sleep ended and he had to go through the lesson
again for three hours before breakfast.

1. The learn-while-you-sleep method           than other learning methods.

A. can get better result
B. is more acceptable
C. is more tiring
D. is harder

2. By this method, one            .

3. In the experiment, lessons were given           .

A. in the night-time
B. after soft songs were broadcast
C. while the student was awake
D. all through the twelve hours

4. Before each lesson finishes, the students has to             .

A. get up and take breakfast
B. be wakened by a loud noise
C. listen to the lesson again in sleep
D. review the lesson by himself

         Strange thing happens to time when you travel. Because the earth is divided into twenty-four time zones
one hour apart, you can have days with more or fewer than twenty-four hours, and weeks with more or fewer
than seven days. 
         If you make a five-day trip across the Atlantic Ocean, your ship enters a different time zone (时区) every
day. As you enter each zone, the time changes the hour. Travelling west, you set your clock back; travelling
east, you set it ahead. Each day of your trip has either twenty-five or twenty-three hours.
         If you travel by ship across the Pacific you cross the International Date Line. By agreement, this is the
point where a new day begins. When you cross the line, you change your calendar the full day, backward or
forward. Travelling east, today becomes yesterday; travelling west, it is tomorrow!

1. The best title for this passage is              .

A. A Trip Across the Atlantic
B. How Time Changes Around the World
C. Crossing the International Date Time
D. How Time Zones Were Set up

2. From the passage it seems true that the Atlantic Ocean               .

3. The International Date Line is the name for                .

A. the beginning of any new time zone
B. the point where time change by one hour
C. the point where a new day begins
D. any time zone in the Pacific Ocean

4. If you cross the ocean going east, you set your clock             .

A. ahead one hour in each new time zone
B. ahead one time for the whole trip
C. back one full day for each one full day
D. ahead by twenty-three hours