题干

有些植物受到伤害时,会分泌出____来保护自身。

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毒性物质

同类题1

阅读下面语段,完成后面练习题

    范晔,字蔚宗,顺阳人,车骑将军泰少子也。母如厕产之,额为砖所伤,故以砖为小字。出继从伯弘之,袭封武兴县五等侯。少好学,博涉经史,善为文章,能隶书,晓音律。年十七,州辟主簿,不就。高祖相国掾,彭城王义康冠军参军,随府转右军参军,入补尚书外兵郎,出为荆州别驾从事史。寻召为秘书丞,父忧去职。服终,为征南大将军檀道济司马,领新蔡太守。道济北征,晔惮行,辞以脚疾,上不许,使由水道统载器仗部伍。军还,为司徒从事中郎。顷之,迁尚书吏部郎。元嘉元年冬,彭城太妃薨,将葬,祖夕,僚故并集东府。晔弟广渊,时为司徒祭酒,其日在直。晔与司徒左西属王深宿广渊许,夜中酣饮,开北牖听挽歌为乐。义康大怒,左迁晔宣城太守。不得志,乃删众家《后汉书》为一家之作。在郡数年,迁长沙王义欣镇军长史,加宁朔将军。兄皓为宜都太守,嫡母随皓在官。

    十六年,母亡,报之以疾,晔不时奔赴;及行,又携妓妾自随,为御史中丞刘损所奏。太祖爱其才,不罪也。服阕,为始兴王濬后军长史,领南下邳太守。及濬为扬州,未亲政事,悉以委晔。寻迁左卫将军、太子詹事。晔长不满七尺,肥黑,秃眉须。善弹琵琶能为新声上欲闻之屡讽以微旨晔伪若不晓终不肯为上弹。上尝宴饮欢适,谓晔曰:“我欲歌,卿可弹。”晔乃奉旨。上歌既毕,晔亦止弦。

                                                           (选自《宋书》卷六九)

同类题3

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    Millions of Chinese have been playing a mobile game called Travel Frog recently. You play as the “mother” of a frog who lives alone and enjoys traveling. You need to prepare food and tools for his trips. The frog will send you postcards while he is away.

    The game's popularity may have something to do with how lonely people are these days, according to the Xinhua News Agency. Many players have said that the lonely frog is just like them. But playing with the frog helps them forget their loneliness for a short time.

    Loneliness seems to be a common problem today. According to the Guardian, about 40 percent of American adults say they're lonely. And in the UK, about one in five people in the country are “always or often lonely”, The Telegraph reported.

    This might be why the UK government declared (宣布) the country's very first “Minister of Loneliness” (孤独大臣) in January. The minister's job is to find ways to help UK citizens feel less lonely. The minister's office will provide more money for activities that connect people together.

    This loneliness problem may be partly due to social media. When we see pictures of friends having fun or posting selfies (自拍) without us, we may compare their “perfect” lives with our own and feel inferior (较差的) and lonely.

    But we should remember that no one is destined (注定) to be lonely. As UK poet John Donne once wrote, “No man is an island, entire of itself; every man is a piece of the continent (陆地), a part of the main.”

    Tips to get rid of loneliness

    Sing your favorite songs.

    Connect with a friend.

    Do something creative, such as drawing a picture.

    Imagine some place you'd like to visit, like a fun gathering or a sporting event.