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The loveliest house that I have ever lived in is Crosslands.I lived there with my grandparents when I was a child. The house seemed so huge to me as a child.And it had a lovely living room with a piano in it.And there wa

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Wolves For years people are afraid of wolves and don\’t understand them.The wolves are the bad animals in many stories.How did these animals get such a bad reputation?It\’s because people think they are sneaky and always

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We sometimes have the wrong ideas about the things around us.For example,some things about cats that people believe might not be true.These myths（荒诞的说法） can make cat owners confused（困惑的）.Let\’s learn the truth about them

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A little boy was spending his Saturday morning playing in his sandbox（沙坑）.While he was building roads and houses in the soft sand,he discovered a large stone in the middle of the sandbox. The little boy tried to move it,

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Mount Huangshan is located in Anhui Province.It is famous for its" five wonders"— unusual pin e trees,strangely- shaped rocks,amazing sea of clouds,hot springs,and winter snow.Many people visit it to enjoy its natural be

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Have you ever thought about traveling to the U.K.or studying there?If your answer is （1）______,then you should learn a thing or two about British etiquette（礼仪）.It will help to make sure that your behavior（行为） is always （

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I\’ve patience（耐心）.I don\’t want to hear you anymore.（ ）

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—The writing competition is coming.I am so nervous. —Take it easy.You do well in stories.（ ）

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Mr.Green worked all day long he fell asleep in a minute.（ ）

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— have you had the bike,Tom? —For three days.My parents bought it as my birthday gift.（ ）

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the work on time,all the workers kept working for 12 hours without resting.（ ）

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—Could you please help me make my bed? —I\’m afraid I .You do it on your own.（ ）

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If it rains tomorrow,you may come next week .（ ）

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—Tony,it is kind you to help me clean the classroom. —That\’s OK.It is our duty to keep our classroom tidy.（ ）

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The Best Place in My Heart Who did the speaker go there with? His（1）______. How did they get there? By（2）______. What was the weather like there? Neither（3）______ nor cold. What did they do there? They took some photos a

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如图,在$Rt\triangle ABC$中,$\angle C=90^{\circ}$,$AB=5$,$BC=4$. $(1)$请用无刻度的直尺和圆规作$\angle B$的平分线；(保留作图痕迹,不写作法） $(2)$若（1）中$\angle B$的平分线交$AC$于$D$,求$CD$的长.

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先化简,再求值: $(1)x^{2}(x-1)-x(x^{2}+x-1)$,其中$x=\frac{1}{2}$. $(2)\left(2m+1\right)\left(2m-1\right)-\left(m-1\right)^{2}-\left(2m\right)^{3}\div 8m$,其中$m$满足$m^{2}+m-6=0$.

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先化简,再求值:$(1-\frac{1}{x+1})÷\frac{{x}^{2}-1}{{x}^{2}+2x+1}$,其中$x=2$.

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$(1)$先化简$(1-\frac{3}{a+2})÷\frac{a^{2}-2a+1}{a^{2}-4}$,再从$-3 \lt a \lt 3$中选取一个你喜欢的整数$a$的值代入求值； $(2)$已知$\frac{\sqrt{3}+1}{\sqrt{3}-1}$的整数部分为$a$,小数部分为$b$,求$\sqrt{a}-b$的值.

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下列关于生物多样性与保护的叙述中,正确的是（ ）

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