It’s not known whether chronic stress will harm the narwhals, but researchers are concerned. “The results are disturbing because they suggest narwhals aren’t physiologically equipped to sustain, in good health, repeated exposure to stressful events,” says Randall Reeves, a marine mammal expert in Hudson, Canada, who chairs the International Union for Conservation of Nature Species Survival Commission’s Cetacean Specialist Group. “It makes me worry that narwhals are even more specialized than was previously thought, and that they
举一反三
- Which statement about narwhals is NOT true? </p></p>
- It can be inferred from the passage that scientists of the 18th century ______. A: thought that they knew a great deal and could solve most problems of science B: were afraid of facing up to the realities of scientific research C: knew that they were ignorant and wanted to know more about nature D: did more harm than good in promoting man's understanding of nature
- People are concerned about the environment issue because air and water pollution not only affects everyone’s health but also makes it difficult for businesses to ______.
- Exposure to high-pitched noise results in more errors than exposure to low-pitched noise
- What's not true about stress A: stress makes you social B: stress makes you compassionate and caring C: stress makes you more willing to help the people you care about D: you should get rid of stress rather than be better at stress