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（1）The picture above may be from ______. A．a story B．a diary C．a letter D．a newspaper （2）______ of Chinese people don\’t have sleeping problems. A．19% B．22% C．59% D．81% （3）Who goes to bed latest? ______ A．People born in

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Ann a was a 9-year-old girl from a small village.She finished primary school till the 4th grade at her village.For the 5th grade,a famous school in the city （1）______ her.Anna got very happy.Today was the （2）______ day o

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-I think Millie is careful enough to be an accountant in the future．（ ） -．____She makes mistakes at times and she doesn\’t like working with numbers．

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-What did your father say to you just now? -He asked me ．（ ）

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-Mum, why do I have to wash hands so many times a day? -For your health, you______be too careful．（ ）

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Wearing white can help people _______when they feel stressed．（ ）

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It's reported that nine stations on Nanjing Metro Line 3are decorated to ______ scenes from the Dream of Red Mansions （红楼梦）．（ ）

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Jackie Chan is a ______ actor． He has ______ made some great movies over the years．（ ）

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My father doesn't like shopping much．he would rather TV at home than ． around for hours in shops（ ）

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The Typhoon（台风） Beibijia hit Pudong,east China\’s Shanghai, Sept.16,2024.（ ）

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—Daniel,look at the in the sky!It\’s really beautiful! —Yes.Let\’s take a photo of it.（ ）

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What is the main topic of the passage? （1）______ can change people\’s feelings. Why are some books green? Because green is good for the（2）______ eyes. How does the colour red make most people feel in a restaurant? The co

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已知关于$x$一元二次方程$x^{2}-ax+a-1=0$. $(1)$求证:无论$a$取任何实数值,方程总有实数根； $(2)$当$a=4$时,方程的两实数根是等腰三角形的两边,试求等腰三角形的周长.

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若正比例函数$y=kx$的图象过第二、四象限,则关于$x$的一元二次方程$x^{2}+x+k=0$的根的情况是（ ）

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关于$x$的一元二次方程$x^{2}+2x-k=0$有两个不相等的实数根,则$k$的取值范围是____.

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若关于$x$的一元二次方程$x^{2}-bx+3=0$有一个根是$3$,则$b$的值是（ ）

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已知关于$x$的一元二次方程$x^{2}+2mx+m^{2}-4=0$. $(1)$求证:无论$m$为何值,该方程总有两个不相等的实数根. $(2)$若该方程的两个根为$p$和$q$,且满足$pq-p-q=0$,求$m$的值.

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若$x=-2$是关于$x$的一元二次方程${x}^{2}-\frac{5}{2}mx+{m}^{2}=0$的一个根,则$m$的值为（ ）

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关于$x$的方程$nx^{2}-\left(2n-1\right)x+n=0$有两个实数根,则$n$的取值范围是（ ）

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已知关于$x$的方程$x^{2}+3x+k-2=0$有两个不相等的实数根. $(1)$求$k$的取值范围； $(2)$设方程的两个根分别为$x_{1}$,$x_{2}(x_{1} \gt x_{2})$,若$(x_{1}-1)(x_{2}-1)=-1$,求$k$的值及方程的根.

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