Each year, from top to bottom, a tree grows a new layer (层) of wood around itself. If you cut across a
tree trunk or branches, you would see that these layers of wood look like rings. By counting tree rings, you
can tell how old the tree is. If you count ten rings, for example, the tree is ten years old.
Looking at the picture shown above, you can see that each tree ring has a dark part and a light part. The
light part wood grows in the spring, the dark part wood in winter. Look also, that some rings in the picture
are wide and others are narrow (窄). Trees grow aide rings during the years when they get a lot of water and
sun-light. By examining tree rings, you can tell what the weather may was like many years ago.
Giant sequoia (红杉) trees, such as the one in the photo above, grow in north-western California. Some of
these sequoias have more than 3000 tree rings. Can you guess how old such a tree would be?
B: layer of wood
C: giant sequoia
D: ten years old
B: every year
C: every 3000 years
D: every two years
B: tells the tree"s age
C: grows in the spring
D: gets light every year
B: most trees do not grow tree rings
C: tree rings add to the tree"s width
D: most of the trees grow rings
B: five months old.
C: Six years old.
D: Ten years old.
During the day we work and play; at night we sleep. Our bodies rest while we sleep. In the morning we
are ready to work and play again. While we are asleep our bodies grow most. Children who are tired usually
need more sleep. We can get our lessons better and we feel better too, when we have had plenty of rest.
Boys and girls who are eight or nine years old need ten hours of sleep every night. Our bodies need plenty
of air when we sleep. If we do not get enough fresh (新鲜的) air we"ll feel tired when we wake up. While
in bed we must not cover our heads. If we do, our lungs (肺) will not get enough fresh air. If we open our
windows at night we can have plenty of fresh air. Cool air is better than warm air. Boys and girls who want
to grow and be strong must get plenty of sleep.
B. playing
C. sleeping
D. waking
B. Cool air
C. Warm air
D. Dry air
B. hungry
C. tired
D. grow
B. Nine hours
C. Ten hours
D. Eeven hours
B. Food
C. Rest
D. Exercise
always prepare before every trip. But what"s the best navigation tool, a Global Positioning System (GPS) or
a good old map and compass? Five of my friends and I hiked through the mountains on a trail I marked. One
team of three carried a GPS, and the other team used a map and compass.
It took the GPS team 3 hours and 11 minutes to get through the whole hike, however, it took the map and
compass team only 2 hours and 49 minutes. The biggest problem the GPS team met was that they lost the
satellite signal (卫星信号) in some places. With no map or compass, they had to walk around until they were
in a place where the signal was good. The map and compass team was able to spot (认出) different landmarks,
compare them to their maps and then use the compass to point them in the right direction.
When I head out on my future hikes, I"m bringing a map, a compass and a GPS to show me the way.
B. know how to use the GPS
C. want to get lost in mountains
D. want to get into the mountains alone
B. went along the same trail
C. had the same problem
D. finished the whole hike at the same time
B. it wasn"t necessary to bring a map and a compass together with a GPS
C. the GPS had some disadvantages in hiking in mountains
Dreams take up about one quarter of our sleeping time. People have several dreams each night. Dreams
are like short films.They are usually in colour. Some dreams are like old films.They come to us over and over
again. That may be because the dreamer is worrying about something. Dreaming may be a way of trying to find
an answer.
Some people get new ideas about their work from dreams. They may have been thinking about their work
all day. These thoughts can be carried over into dreams.
Sometimes we wake up with a good feeling from a dream. But often we can"t remember the dream.
Dreams can disappear quickly from memory.
Too much dreaming can be harmful. The more we sleep, the longer we dream. The mind is hard at work
when we dream. This is why we may have a long sleep but we feel tired when we wake up.
B. a one-hour
C. a one-quarter
D. an eight-hour
B. Because they are not interested in their work.
C. Because they may be this thinking about their work all day.
D. Because they have too much work to do.
B. people like to sleep
C. dreams are like films
D. we always remember dreams
Dreams take up about one quarter of our sleeping time. People have several dreams each night. Dreams
are like short films. They are usually in colour. Some dreams are like old films. They come to us over and
over again. That may be because the dreamer is worrying about something. Dreaming may be a way of
trying to find an answer.
Some people get new ideas about their work from dreams. They may have been thinking about their work
all day. These thoughts can be carried over into dreams.
Sometimes we wake up with a good feeling from a dream. But of ten we can"t remember the dream.
Dreams can disappear quickly from memory.
Too much dreaming can be harmful. The more we sleep, the longer we dream. The mind is hard at work
when we dream. This is why we may have a long sleep but we feel tired when we wake up.
B. a one-hour
C. a one-quarter
D. an eight-hour
B. Because they are not interested in their work.
C. Because they may be this thinking about their work all day.
D. Because they have too much work to do.
B. people like to sleep
C. dreams are like films
D. we always remember dreams
right-handed or left-handed. It is not true that it is caused by the 2 in which his parents educate him. In
other words, a person is 3 to be right-handed or left-handed. Moreover, the left-handed and the right-handed
"think" differently. 4 use the hand you"re not 5 can be very upsetting.
One day I tried an experiment: 6 hands while eating rice with chopsticks. Being a right-hander, I hoped
it would not be too 7 for me to take the food with my left hand. Soon after I started, I realized I didn"t know
what I was 8 . So I moved in front of a big mirror, in order that I could observe my 9 clearly. Looking at
myself in the mirror, I found I looked 10 a man who had 11 used chopsticks. I grew more and more nervous
and finally I had to 12 .
My experience shows, being 13 to use the hand one is not used to affects a person"s mind. So we should
not try to change a left-hander to a right-hander. Some people still think 14 is bad, but luckily this idea is 15 .