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---What are you doing now?
---I ______ English since graduation．
- A.have taught
- B.teach
- C.taught
- D.have been teaching
---What are you doing now?
---I’m listening to the storytelling “The Outlaws of the Marsh” ________．
- A.on the air
- B.in the air
- C.in the open air
- D.off the air
—I am busy prepare for my coming driving test.
2. We are going to take gentle walks along the beach to look out the seals.
3. In order to go on an adventure holiday in the Sahara Desert, Collin has to collect a plenty of information about it.
4. I look forward to receive your postcards from different continents all over the world.
5. Mountain climbing can be very tiring, and many people get sick because the high altitude.
6. When writing an informal letter, we usually begin our letter by a casual and friendly greeting, such as “How are you?”
7. What you have said is not related to what we are concerned now.
8. The laptop computer on show is very worth buying.
9. The music was sounded beautiful. It was popular among adults.
10. The basic equipment you need for hiking are simple: good shoes, clothes and a backpack.
11. As we were going to watch the sunriseearly the next morning, we went to bed earlier than usually.
12. After the scaring sandstorm, we three sat in total silent and looked at the beautiful pinks and yellows of the sunset.
13. A library with a lot of equipments of chemistry is offered to the Hope School.
14. Except flowers, the pupils sent their teacher a nice greeting card for her birthday.
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—What are you doing, John? Why stop?
—To be on the safe side, we’d fill up the car now for we _______ run out of gas on the way．
- A.must
- B.will
- C.might
- D.should
eyes. You're thinking. You're breathing. You're listening. Possibly you're shifting(变换) positions. You're
also feeling things—this book, your chair, emotions. What lets you do all these things at the same time?
Your brain.
Your brain is the control center of your body and mind. Without your brainyou can't do anything. Your brain has more than 100 billion nerve(神经) cells. Each nerve cell makes from 1,000 to 10,000 connections with other nerve cells. The nerve cells send impulses back and forth in your brain and to and
from every part of your body. After you reach the age of 20, though, your brain cells start to die. This is
common. However, if you suffer an illness, or injury, even more nerve cells die in your brain. When a
nerve cell dies, the thousands of connections it made with other nerve cells are lost.
Until recently, scientists believed that the brain did not replace its dead cells. New studies, however,
prove not. Scientists have found new nerve cells in a part of the brain called the hippocampus(海马区).
The hippocampus helps the brain form memories from new experiences.
The discovery of these new nerve cells is not a cure for anything yet. It gives hope,
however, of a curefor brain damage from such things as epilepsy(癫痫病), Lou Gehrig's disease, car accidents, and strokes. Someday scientists might be able to use the new cells to replace damaged brain cells. Such a cure,
how
ever, may take about ten years to develop. So at the same time, use your head—protect it!B. make connections only to other cells in the brain
C. can cure Lou Gehrig's disease
D. are a person's memory
B. should be careful not to injure their brains
C. have a skull (头盖骨) that provides all the protection needed by the brain
D. would see a quick cure for brain disease
B. comparing it to other parts of the brain
C. telling how it got its name
D. explaining what it does
B. disorders
C. memories
D. messages