Scientist Florence Wambugu works with farmers in Kenya, a country in East Africa. She helps them grow bigger and better crops. Wambugu is especially interested in finding simple ways to produce more food.
In the past ten years, Wambugu has spent much of her time studying sweet potatoes, which are an important food in her part of Kenya. A virus (病毒) kept attacking the plants. It stopped the sweet potatoes from growing well. Because of the virus, some farmers lost three quarters of their crops.
Wambugu went to war against the virus. Her research for a way to save the sweet potatoes led to a lab in St. Louis, Missouri.
The lab mainly works on genes (基因), the chemical “computer programs” found in the cells of living things. Genes tell a plant to produce pink flowers or an animal to grow black hair. Now scientists have found ways to move genes from one living thing to another. That process is called genetic engineering.
Wambugu spent three years in the lab. As a result, she created a sweet potato plant that could fight off the virus. Wambugu tested her research in Kenya, and her plants produced wonderful sweet potatoes.
That’s just the beginning, Wambugu believes. Genetically modified (转基因的) foods, she thinks, could help farmers in poor countries grow badly needed crops, thus, fewer people will go hungry.
1.The text is written mainly to _______.
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A．tell us sweet potatoes are in danger of being attacked by a virus |
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B．introduce Wambugu’s contribution to genetic engineering |
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C．introduce a new way of killing plant viruses |
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D．tell how hard Wambugu worked in her lab for three years |
2.What caused Wambugu to set up a lab in St. Louis, Missouri?
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A．Her wish to save sweet potatoes in Kenya. |
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B．Her great interest in genetic engineering. |
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C．Her love for sweet potatoes. |
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D．Her interest in plant life. |
3.The fourth paragraph mainly explains what ________ is.
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A．a crop virus |
B．chemical technology |
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C．a computer program |
D．genetic engineering |
4. What is Wambugu’s attitude toward “genetic engineering”?
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A．It will help more hungry people. |
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B．It should be carefully used. |
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C．It has more disadvantages than disadvantages. |
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D．It is a too expensive technology at present. |
I finished my last work of the week and could hardly wait to get home, take off my nursing shoes, and relax.
As I _36_ my car, I saw one of my _37_ standing by the bus stop. I thought it would only take a couple of extra minutes to give her a ride home, and _38_, it was too cold to be standing outside on the coldest _39_ in January. I didn’t know where she lived, but I was _40_ I would be able to find my way back.
We _41_ about our work as I drove and _42_ we knew it, we arrived at her house. I started driving back. _43_ looked familiar, but at first that didn’t _44_ me. But soon I _45_ something wrong. I recognized nothing. But I told myself to stay _46_.
I was _47_ neighborhoods, streets and even streetlights. I no longer knew where I was now. How could I be so stupid! I looked down at my _48_. It was now 2:30 a.m. My gas was slowly running out. I _49_ the car and turned off the engine. In total defeat, I put my head down on the wheel, _50_. Then I raised my head and saw a(n) _51_ down the road in front of me. I turned my headlights on. A car! I drove a little _52_, got out of my car and knocked on the window of that car. An elderly man _53_ rolled his window down.
I said that I didn’t know how to get back into town. In silence, he started driving. I ran back to my car and drove behind him. Finally I _54_ a familiar street. As I turned to head home, the car disappeared. Then I _55_ my driveway (车道) when the warning light for my gas tank (汽油箱) turned on.
Though so many years have passed, I still thank the old man from my deepest heart.
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Up to now, large quantities of food ____ to Africa to save the starving people.
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A．is sent |
B．has been sent |
C．have been sent |
D．are sent |
---Why did you stop writing?
--- I _____ my writing paper.
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A．ran out of |
B．have been used up |
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C．have used up of |
D．have run out |
The building _____ Rome times has been rebuilt recently.
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A．dates back to |
B．date from |
C．dating back to |
D．dated from |
President Obama declared America was not and never would be ____ war _____ Islam.
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A．on; in |
B．at; in |
C．with; at |
D．at; with |
