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Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word or phrase that best fits each blank.

Dogs haven’t always been man’s best friend, and the question of when and where they were first domesticated is surprisingly complex. A new study sheds some light on the issue; with an international team of scientists【小题1】 (point) to Central Asia as the best candidate for the origin of today's pups.

The study is 【小题2】 (expansive) one to date. It used three types of DNA 【小题3】 (gather) from 161 breeds of 4, 500 dogs, along with 549 “village dogs”—feral (未驯化的) dogs 【小题4】 make up an estimated 75 percent of the world’s total dog population—from 38 countries.

While it's long been known that dogs can trace their roots to gray wolves, the new analysis is the strongest indicator yet that modern dogs originated in 【小题5】 is now Nepal and Mongolia over 15,000 years ago. The DNA of dogs in nearby areas like East Asia and Southwest Asia is extremely diverse, giving the scientists confidence 【小题6】 (make) the claim.

However, 【小题7】 the study is impressive for its extensiveness, the scientists are cautious about making a definitive statement on dogs' origins. Previous studies 【小题8】(place) dogs’ ancestral tree (族谱) in other regions like Siberia and Europe. Adam Boyko of Cornell University, one of the study’s researchers, called the origins of modern dogs “extremely complicated”. He said that it was possible that dogs were domesticated elsewhere 【小题9】 arriving in Central Asia and diversifying into modern dogs.

Anyway, the study’s large population sample is remarkable, representing a clearer picture of dogs and 【小题10】 they come from.

20-21高二上·上海·课时练习
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Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.

Owning a Pet Is Good for Your Health

Pets in America are incredibly well loved: according to a 2015 Harris poll, 95% of owners think of their animal as a member of the family. About half buy 【小题1】 birthday presents. And it’s a two-way street. People who have pets tend to have lower blood pressure, heart rate and heart-disease risk than those who don’t. Those health benefits may come from the extra exercise that playing and walking 【小题2】 (require), and the stress relief of having a steady best friend on hand.

Scientists are now digging up evidence 【小题3】 animals can also help improve mental health, even for people with challenging disorders. Small 【小题4】 the studies are, the benefits are impressive enough that clinical settings are opening their doors to animal assisted interventions — pet therapy, in other words — used alongside conventional medicine. “【小题5】 (think) of an animal in a hospital used to be one of the great no-no’s,” says Alan Beck, director of the Center for the Human-Animal Bond at Purdue University, citing the fear of causing infection. “Now, I don’t know of any major children’s hospital 【小题6】 at least some kind of animal program.”

The rise of animal therapy 【小题7】 (back) by increasingly serious science showing that social support — a proven antidote to anxiety and loneliness — can come on four legs, not just two. Animals of many types can help calm stress, fear and anxiety in young children, the elderly and everyone in between.

More research is needed 【小题8】 scientists know exactly why it works and how much animal interaction is needed for the best results. But 【小题9】 (publish) studies show that paws have a place in medicine and in mental well-being. “The data is strong,” Beck says. “If you look at 【小题10】 animals do for people and how we interact with them, it’s not surprising at all.”

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