2022英语周报八年级新目标HNX第二期答案

17.解:(1)设数列{an}的公差为d,数列{b}的公比为q,因为a1=b1=1,b+S4=32,b2=a2+1q2+6d+4=32解得二(=-103分为d>0,q>0,所以,所以an=2n-1,bn=45分(2)由(1)知an=2n-1,bn=4"-16分所以T.=T21=-1,s.=(1+2x4=1=A2m-22m-1因为T>342+S,所以3>342+42-2,所以42-2>1027,因为45=1024,4=409611分所以2n-2>5,即n>>3,因为n∈N,所以使不等式T>342+S,成立的最小正整数n的值为4.

短文改错Yesterday, the flash flood hit our area.the road was flooded The bus had to becanceling because of theood. so I hadto do butwalk home with two heavy bags.canceled/cancelledcouldn t find my way but come across anyone in the dark. I was so afraid and nervous, How I hoped Asomeones help! Just then I felt a hand touching my arm, where made me really surprised. He turned out that itwhichltwas my new classmate Wang Ping that rides his bike. He quickly got off his bike and carried one of my bag tomy house while pushing his bike. I sincerely thanked him for leading me home in the dark.71.the-a【解析】考查冠词。此处第一次提到food,故改为不定冠词a2. Lucky- Unluckily【解析】考查副词。根据句意“不幸的是,道路被淹没了”可知,此处应该用副词 UnluckilyUnluckily在此处充当状语,修饰整个句子73. canceling- canceled/ cancelled【解析】考查非谓语动词。根据语境可知,此处应该用 canceled/ cancelled其与be动词构成不定式的被动式74.删除but后的to【解析】考查非谓语动词。固定句型" have nothing to do but+动词原形”意为“除了无事可做”。在这种句型中,只要前面有实义动词do,后面的不定式省去to75.but-or【解析】考查连词。or用于否定句提出两种事物时,意为“也不”。故此处用or连接两个动词6. hoped后面加fr【解析】考查介词。 hope for是固定词组,意为“希望;期待”77. where- which【解析】考查定语从句。分析句子结构可知,此处应该用关系代词 which引导非限制定语从句,且 which在从句中充当主语,指代前面的整个句子。78.He-It【解析】考查代词。此处的句型是“ It turned out that.",意为“结果是……”,it在此句中是形式79. rides-rode【解析】考查时态。根据上下文时态和开头的时间状语" Yesterday"可知,此处应该用一般过80.bag-bags【解析】考查名词单复数。“ one of+名词复数形式”是固定搭配,故此处应该用名词复数bags

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