亚洲免费av电影一区二区三区,日韩爱爱视频,51精品视频一区二区三区,91视频爱爱,日韩欧美在线播放视频,中文字幕少妇AV,亚洲电影中文字幕,久久久久亚洲av成人网址,久久综合视频网站,国产在线不卡免费播放

        ?

        飛蛾為何要“撲火”?

        2024-08-07 00:00:00鄭文琴
        求學·理科版 2024年13期

        Turn on a light outside at night, and it won’t be long before lots of insects start gathering around it. This behavior has led to a popular comparison for attraction, “l(fā)ike a moth to a flame.” However, according to a new study published in the journal Nature Communications, it turns out that insects aren’t “attracted” to artificial lights, but rather confused by it.

        The new finding is based on a theory about insect orientation (定位) . Due to their small and lightweight bodies, insects experience less air resistance, allowing them to achieve higher accelerations (加速度) , which in turn makes it challenging for them to sense up and down during flight. So, they typically rely on stable light sources like the moon and stars to orient themselves at night, keeping the sky at their backs to stay upright. However, the introduction of artificial lights confuses their natural sense of direction. The insects you see circling street lights, in other words, are probably lost.

        To reach these conclusions, scientists used high-resolution cameras to film insects flying around artificial lights in Costa Rica. They also attached tiny sensors to insects and filmed motion-capture videos of them in flight. In this way, researchers are able to slow down the insects’ pace and study their movements in greater detail. The videos showed insects turning their backs toward sources of artificial light — even at the price of flipping over or crashing.

        This can be dangerous for insects, as circling around artificial lights can put them at risk from enemies, exhaustion, and starvation, causing many to die before morning. Night artificial light is a major cause of insect population loss, which could severely impact crop pollination (傳粉) and food supplies for larger animals, including humans. “Insects have been flying around for 370 million years, and it’s just in the last 150 years that it’s really gone wrong for them,” says entomologist Samuel Fabian of Imperial College London. “If we don’t want to influence large amounts of insect populations, we should not have lights shining up into the sky.”

        (材料來自Smithsonian magazine)

        1. According to the new study, what does the comparison “l(fā)ike a moth to a flame” symbolize?

        A. Insects’ natural habitat destroyed by a flame.

        B. Insects’ confusion with artificial lights .

        C. Insects’ attraction to artificial lights.

        D. The possible danger of using artificial lights.

        2. According to the previous theory, what is the main reason why insects have difficulty sensing direction when flying?

        A. The brightness of the moon and stars.

        B. The presence of artificial lights.

        C. Their body size and weight.

        D. The lack of air resistance.

        3. What does the third paragraph talk about?

        A. Why the scientists studied the artificial lights.

        B. How the insects moved and crashed .

        C. Why the researchers used cameras.

        D. How the professionals conducted the study.

        4. What does Samuel Fabian suggest to minimize the impact on insect populations?

        A. Installing more artificial lights to help insects navigate.

        B. Avoiding the natural light putting the insects at risk.

        C. Limiting the use of lights that shine upwards into the sky.

        D. Developing new types of artificial lights that insects can avoid.

        1. B。解析:詞義理解題。材料第一段提到“‘like a moth to a flame’這個短語通常用來比喻昆蟲被人造光源吸引。然而,根據(jù)新的研究成果,昆蟲實際上是被人造光源迷惑了”,B選項“昆蟲被人造光源迷惑”與材料內(nèi)容相符,故選B。

        2.C。解析:細節(jié)理解題。材料第二段的第二句提到“根據(jù)之前的昆蟲定位理論,由于昆蟲身體小且輕,它們在飛行中遇到的阻力較小,能夠?qū)崿F(xiàn)更高的加速度,這使得它們在飛行中難以感知上下方向”,C選項“它們的體型和重量”與材料內(nèi)容相符,故選C。

        3. D。解析:主旨大意題。材料第三段主要討論了科學家如何具體開展研究,包括“used high-resolution cameras to film...attached tiny sensors to insects and filmed...to slow down the insects’ pace and study their movements...”,D選項“專家如何開展研究”與材料內(nèi)容相符,故選D。

        4. C。解析:觀點態(tài)度題。材料最后一段的最后一句提到了昆蟲學家塞繆爾·法比安的建議,“如果我們想最小化對昆蟲種群的影響,就不應該讓燈光照向天空”,C選項“限制使用向上照射天空的燈光”與材料內(nèi)容相符,故選C。

        av天堂最新在线播放| 国产v精品成人免费视频400条| 亚洲精品一区二区视频| 亚洲成人av在线蜜桃| 国产精品无码aⅴ嫩草| 在线中文字幕有码中文| 亚洲av伊人久久综合性色| 婚外情长久的相处之道 | 亚洲第一se情网站| 亚洲熟妇色xxxxx欧美老妇| 中文字幕久区久久中文字幕| 91自拍视频国产精品| 最近在线更新8中文字幕免费| 久久精品无码一区二区三区不| 大屁股流白浆一区二区| 成人影院在线视频免费观看| 性激烈的欧美三级视频| 国产精品原创av片国产日韩 | 99久久久69精品一区二区三区| 久久国产精品色av免费看| 免费无遮挡无码永久视频| 久久亚洲精品无码va大香大香| AV无码专区亚洲AVL在线观看 | 在线看亚洲十八禁网站| a级福利毛片| 高清成人在线视频播放| 精品国产一区二区三区2021| 一本久久a久久精品亚洲| 超级碰碰人妻中文字幕| 亚洲精品偷拍自综合网| 一本久久伊人热热精品中文字幕| 欧美日韩精品福利在线观看| 国产在线观看免费不卡视频| 精品午夜福利在线观看| 欧美性猛交xxxx乱大交丰满| 亚洲国产一区二区三区在观看 | 亚洲aⅴ无码日韩av无码网站| 日韩伦理av一区二区三区| 精品露脸国产偷人在视频| 久久久久亚洲av无码a片软件| 美腿丝袜一区二区三区|