A. mustn’tB. needn’t

C. wouldn’tD. shouldn’t

A. to let B. letting C. let D. having let

A. When grandma is coming over.

B. When his mother will be home.

C. When he should call the woman.

A. destroyed B. injured C. hurt D. damaged

The world could be one step closer to quick and inexpensive Ebola detection thanks to a teenager from Connecticut.

Olivia Hallisey, a junior at Greenwich High School, was awarded $50,000 in the Google Science Fair for her new method that detects Ebola, a virus that causes bleeding from different parts of the body and usually causes death. Olivia’s method is to ask patients to put their saliva (唾液) onto a testing card. The card changes color if the person is catching Ebloa. Present Ebloa tests take up to 12 hours and cost $1,000. Olivia’s method, however, can be done just in 30 minutes for about $25. Besides, the sample (样本) doesn’t have to be put in a refrigerator thanks to the silk material Olivia uses to produce the testing cards.

Olivia was inspired to deal with this global problem after watching the news that more than 10,000 people died from Ebola in West Africa. She was particularly worried about the fact that, while the acts of involvement can improve survival rates, present detection methods are costly, time-consuming and require complex tools. Olivia got help from her science research teacher. She drew out directions from past research, and figured out detection systems that have proven to work with other diseases, including Lyme disease and yellow fever.

“What affects one country affects everyone,” Olivia told CNBC. “We have to work together to find answers to the huge challenges which cause harm to the global health.” The Connecticut’s teen, who hopes to become a doctor one day, was named the Google Science Fair winner in the competition of 20 competitors from across the globe. The fair is open to young people between the ages of 13 and 18 in most countries.

Olivia hopes her success will inspire other girls interested in science and computers. “I would just encourage girls to try it in the beginning, and remind them that they don’t have to feel naturally drawn or feel like they have a special talent for maths or science,” she told CNBC, “but just really look at something they are interested in and then think how to improve something or make it more enjoyable or relate it to their interests.”

【1】According to the passage, present Ebola detection methods ______.

A. must use a large amount of samples

B. may detect other deadly viruses as well

C. have proven to be ineffective in practice

D. require samples to be kept in refrigerators

【2】What can we learn about Olivia’s method?

A. Time-consuming. B. Cheap.

C. Complex. D. Out-of-date.

【3】What does the underlined word “drawn” in Paragraph 5 probably mean？

A. Attracted. B. Controlled.

C. Admitted. D. Exposed.

【4】The Google Science Fair is intended for ______.

A. students B. doctors

C. inventors D. scientists

Is it possible to make paper without trees? Australian businessmen Kevin Garcia and Jon Tse spent a year researching a possible 【1】 that could serve as a possible raw material for making paper. Then Garcia read about a Taiwanese company making commercial paper out of stone and a(n) 【2】 struck.

A year later, in July 2017, they launched Karst Stone Paper. The company produces paper without using wood or water. Their source is stone waste 【3】 from construction sites and other industrial waste dumps.

"If you look at the whole process of how paper is traditionally made, it 【4】 chopping trees, adding chemicals, using lots of water and then 【5】 , drying and flattening it into sheets of paper," said Garcia. "It contributes to high carbon emission and deforestation."

In 2019, Garcia estimates Karst's paper production has helped save 540 large limber trees (成材木) from being deforested, 83,100 liters (21,953 gallons) of water from being used and 25,500 kilograms (56,218 pounds) of carbon dioxide from being 【6】.

"We collect disposed limestone (石灰石) from wherever we can find it, wash it, and grind it into fine powder," he said. The powder is mixed with a HDPE resin(高密度聚乙烯树脂), which 【7】 over time from sunlight, leaving only calcium carbonate (碳酸钙) behind.

The paper can be as thin as notebook paper or as thick as a cardboard paper and is waterproof, 【8】 and difficult to tear. The notebooks cost $10 to $25. Karst's products are mainly sold through the company's website, but are also stocked in 100 stores, 【9】 throughout Australia, the United States and the United Kingdom. "Over 70% of the customers are US-based," he said.

They hope to have the notebooks in 1,000 stores by the end of the year. Garcia said they are now thinking about 【10】 investors for the first time in order to scale up their operations. They declined to reveal how much the company makes or their annual revenue.

—______.

A. It all depends B. It's up to you

C. It doesn't matter D. That's a deal

A. In the post office. B. In a taxi. C. In a hotel.

A. would be putB. were put

C. should be putD. had been put

A. to rangeB. range

C. rangingD. ranged