题型:阅读理解 题类:常考题 难易度:普通
山东省淄博市高青县第一中学2020-2021学年高二下学期英语第一次月考试卷
Japanese researchers are genetically changing mosquitoes so that they become carriers of a vaccine (疫苗) that could vaccinate millions for free. The researchers have already genetically changed a mosquito species so that its saliva (唾液) contains a protein that acts as a vaccine against leishmaniasis (利什曼病), a deadly disease that leads to terrible skin problems. The team confirmed that mice bitten by the genetically-engineered mosquito developed an antibody to the disease, meaning they had built up immunity (免疫力).
"You would be vaccinated without even noticing. You wouldn't need any drug and you wouldn't need to show up at a fixed place for mass vaccinations," said Shigeto Yoshida, the associate professor who has led the research. "Repeated bites would only strengthen the immunity."
Similarly the mosquitoes could be used to help treat malaria (疟疾), perhaps a decade from now, said the malaria expert.
Nearly one million people die each year from malaria — most of them are children — mainly in Africa and Asia, according to the World Health Organization. Now a problem is that no effective vaccine exists. "There is a treatment that works, but it is beyond the reach of people who need to worry about food for tomorrow," Yoshida said.
However, Yoshida expects that the genetically-engineered mosquito will finally help wipe out the deadly disease in the developing world. "Technically speaking, I believe it's a matter of 10 years or so, but it's not clear whether society would accept it," he said.
Another problem is that the genetically-engineered mosquito may still pick up and spread the infected blood of a person who has already caught malaria. Yoshida's team is hoping it can solve this problem by developing a mosquito species that kills the malaria virus inside its own body.
As a gesture of friendship,Mayor Yukio Ozaki of Tokyo,Japan gave Washington, D.C a gift of more than 3,000 Japanese cherry trees on March 17,1912.Every spring, the cherry trees in Washington,D.C. take bloom(开花),beginning one of the country's loveliest celebrations, the National Cherry Blossom Festival (March 17-April 15). Book your trip now to see this vibrant display of pink and white in this city full of history!
Washington, D.C. Cherry Blossom In-Depth Tour
Priee: $45/person
Available: Mar.25-Apr.15
Duration: 1 Day
Highlights: Visit Washington, D.C.; experience the peak period of cherry blossom(April 8-12)
Itinerary: Guests will start to celebrate the National Cherry Blossom Festival and discover the beauty of cherry blossoms. Next,we will begin our sightseeing city tour including Lincoln Memorial, White House, US Capitol, Madame Tussauds Wax Museum, Washington Monument and International Spy Museum. Then visit the next tourist spot, the Jefferson Memorial. It's the best location to view the cherry blossoms. Finally, guests may board a Potomac River cruise to see the city from the water. Then tour ends.
Price Includes: Ground Transportation
Admission Fees:
Destination | Adult | Child | Senior |
International Spy Museum(optional) | $21.95 | $14.95(3-12yrs) | $19.95(Over 65 yrs) |
Madame Tussauds Wax Museum (optional) | $23 | $17(3-12yrs) | $20(Over 65 yrs) |
Potomac River Cruise(optional) | $26 | $18(3-12yrs) | $23(Over 65 yrs) |
Note: If you would like to join in the optional activities, please pay the fee in cash to the tour guide. You cannot buy the tickets on your own or use City Pass. The tour guide will arrange the tickets for the group.
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