1.单选题- (共10题)
小题1.当地土壤的重金属官方检测结果为镉含量超标0.59 mg/kg、铅含量超标60 mg/kg。这里的镉和铬是指
A. 元素 B. 原子 C. 分子 D. 金属单质

A.B物质为可溶物质
B.t2℃时,A、B饱和溶液中,溶质质量相等
C.提纯A(多)B(少)混合物中的A,可用冷却热饱和溶液结晶
D.A、B的饱和溶液从t3℃降温至t2℃,析出的晶体的质量一定是:A>B
2.选择题- (共17题)
阅读下面短文,从短文后各题所给四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑
On our first anniversary, Jack bought a bottle of Casaque, an expensive cologne(古龙香水)for me. "We agreed to save the money for your postgraduate education", I said somewhat half-heartedly as I took it out from a beautifully-wrapped packet. "I am unable not to give something 1 to the world's most beautiful bride, honey!" I held it to my2, and smelled the most pleasant flavor I could ever3. Looking down at my4blue jeans and ugly, ragged tennis shoes, I wondered if I could ever be worthy of it. But I would 5. I used only a little of it every time 6Jack graduated and our life was financially easier. It's a 7the foolish love of a young husband.
Then one day three-year-old Jim was sitting on the floor8the empty cologne bottle. His lips wet, he was making a(n) 9face. He drank my10cologne! "Jack, come quick," I cried, "can cologne11my baby? Jim drank the rest of it!" "It's mostly just alcohol, honey," Jack12me. Little Jim was fine, and my concern for my child was13. I now felt 14to see the empty cologne bottle.
A few weeks later, Jack bought another bottle of my beloved cologne. I 15it as much as I had done to the earlier one. 16, it became three-quarters empty. I thought it best to buy another 17. But the shop assistant told me that there wasn't even a maker of that brand any more.
Now I only use my special cologne on very important occasions, because there will be18to replace it when these last few precious19are gone. But from the bottom of my heart it's not three-quarters empty but still one-quarter full. Perhaps if I'm very careful, I can 20using it for the rest of my life.
阅读下面的文字,回答问题。
我脱了上衣、皮鞋和袜子,穿着牛皮背心走下海去。这时离满潮大约还有半个钟头,我赶紧涉水而过。不到半个钟头,我就到了舰队挺粕的地方,敌人见了我都吓坏了,就从舰上跳到海里去,向岸边泅水逃命,一时跳下水去的不下三万人。我赶快拿出绳索、钩子,把钩子缚在每只船船头的一只孔里,接着又把所有绳子的另一头聚拢起来扎在一起。我正在这样作的时候,敌人就放了几千枝箭,有许多枝箭射中了我的手和脸。……我把眼镜拿出来牢牢地戴在鼻子上。由于我有了这种防御,我继续大胆地工作起来。
补写出下列句子中的空缺部分。
①《诗经·氓》中女主人公充满愤懑地批判男子行为没有准则,情感经常变化的句子是:“{#blank#}1{#/blank#},{#blank#}2{#/blank#}”。
②在《马说》中,韩愈同情那些不遇伯乐而辱没在仆役手中的千里马,并指出这些千里马最后只能落得“{#blank#}3{#/blank#}”的结局。
③苏轼在《赤壁赋》中认为人生如同“{#blank#}4{#/blank#},{#blank#}5{#/blank#}”,接着抒发了人生短暂、长江无穷的慨叹。
实验步骤 | 实验现象 |
①将一小块金属钠放入滴有酚酞试液的冷水中 | 钠块浮在水面上,熔化成闪亮的小球,做不定向移动,随之消失,溶液变红色 |
②将表面积大致相同的镁条和铝条(均已用砂纸打磨过,分别投入足量的相同体积的0.5mol/L的盐酸中 | 镁条剧烈反应,迅速产生大量的无色气体,而铝条反应不十分剧烈,产生无色气体,镁条消失比铝条快 |
③将新制的氯水滴加到新制的Na2S溶液中 | |
④将相同质量的镁条(已用砂纸打磨过)和铝粉分别投入到足量的相同体积的0.5mol/L的盐酸和3mol/L的盐酸中 | 剧烈反应产生气体,但铝粉消失比镁条快 |
请回答下列问题:
3.填空题- (共2题)
-
【1】题量占比
单选题:(10道)
选择题:(17道)
填空题:(2道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:4
7星难题:0
8星难题:3
9星难题:5