Dogs see the world through their noses.Their special ability to recognize specific scents helps them find bombs，guns，drugs and human remains.Man's best friend may also be his best health ally.There are reports about dogs trained to sniff （聞） out cancer，diabetic conditions and other health problems.According to a new study，dogs can do something just as remarkable：sniff out stress in people.
While previous studies have suggested dogs might pick up on human emotions.possibly through smell，questions remained over whether they could detect stress and if this could be done through smell. "This study has definitely proven that when people have a stress response，their odor （氣味） profile changes." said Clara Wilson.a PhD student and first author of the research.Wilson added the findings could prove useful when training service dogs that support people with emotional damage.
Wilson and her colleagues were able to train four dogs to indicate the container holding a particular breath and sweat sample，even when the line-up included unused gauze （紗布），samples from another person，or samples from the same person taken at a different time of day.
Then the team turned to samples collected from 36 people，who were asked to count backwards from 9，000 in units of 17.The participants reported feeling stressed by the task and，for the 27 who carried it out in the laboratory，their blood pressure and heart rate rose.The dogs were taught to pick out samples taken just after the task from two containers holding unused gauze.
The researchers then included not only unused gauze but samples taken from the same participant just before the task，when they were more relaxed.Each set of samples was shown to a single dog in 20 trials.The results reveal that the dogs chose the "stressed" sample in 675 out of the 720 trials.
The team say while it was unclear what chemicals the dogs were picking up on，the study shows humans produce a different odor when stressed.
（1）What has the new study found about dogs？ AA
A．They can detect stress in people.
B．They can influence our emotions.
C．They can discover potential dangers.
D．They can sniff out diseases like cancer.
（2）Why were the participants asked to count down numbers？ BB
A．To help them better focus.
B．To create a tense situation.
C．To test their ability to count.
D．To monitor their blood pressure.
（3）Which of the following can be inferred from the text？ CC
A．Stressed samples are more difficult to identify.
B．Dogs can easily recognize their owners' smells.
C．Human breath and sweat change under pressure.
D．The team will reveal the chemicals dogs nose out.
（4）What can be a suitable title for the text？ DD
A．Dogs Might Also Suffer from Stress.
B．Dogs Contribute to Relieving Pressure.
C．Dogs Aid People with Mental Disorder.
D．Dogs Know When You're Stressed Out.
【答案】A；B；C；D
【解答】
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發(fā)布：2024/5/27 14:0:0組卷：3引用：1難度：0.3
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The government said that the policy speaks for itself and that online coursework is not worth a visa.So far，not any sign of change has been within sight.As students are waiting for the policy to improve，their fall programming and their future remain in limbo.
（1）Why would international students prefer to stay in the US during the pandemic？
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（2）What do international students staying in the United States think of the new rule？
A．The new rule treats them as American citizens.
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A．Favorable.
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（4）What does the underlined phrase "in limbo" in the last paragraph mean？
A．Horrible.
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D．Unbelievable.發(fā)布：2025/1/6 15:30:8組卷：0引用：1難度：0.5 -
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（1）According to the author，people enjoyto seek nature.
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（2）From the second paragraph，we can see that.
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（4）what is the main idea of this passage？
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D．Man can't live without natural areas.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5 -
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B．Migration out of these areas.
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（4）What's the author's opinion on protecting the hotspots？
A．It's simple to carry out.
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C．It's closely connected with local people.
D．It suggests that the local people are well educated.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5
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