1) (使)加速.速度 2) 千米.公里 3) 穿越过.十字形的东西 4) 灯光.光亮.光.浅色的.轻的.点燃 5) 错过.思念 6) 伤害 7) 当--的时候.什么时候 8) 转弯.转变.轮流的顺序 9) 桥 10) 事故.意外的事 11) 小山.丘陵 12) 死 13) 更换.改变.零钱.找头 14) 晚的 15) 公众(的).公共的 16) 危险 17) 规则.规定.统治.支配 18) 夫人.太太 19) 横穿过 20) 小心的.仔细的 21) 会.应当.应该 22) 沿着 23) 快的 24) 在--之前.在--前面 25) 米.公尺 26) 直到--为止 27) 票券.单 28) 使用.利用 29) certainly 30) obey 31) cleaner 32) sidewalk 33) crosswalk 34) straight 查看更多

 

题目列表(包括答案和解析)

请阅读下面短文。根据短文内容从下面方框内的六个选项中,选择五个还原到文中,使短文意思通顺、结构完整。
A few of years ago, I went to Australia for a meeting with my friend, Chris. We decided to drive across country to Brisbane after the meeting ended(结束). The drive was going to take four days and most of it was across the desert(沙漠),    1   
The first day was a lot of fun as we were excited and laughing at each other's stupid(愚蠢的) jokes. By the third day of driving in the seemingly endless(无边的) desert, we began to get bored. We had been quiet for a few hours when in the distance(在远处) Chris found some kangaroos(袋鼠). We were both excited and decided to get a closer(更近) look.  2  .We got closer and closer, and Chris was doing 110 kilometers per(每) hour. We were very close to the kangaroos—too close—when we heard a loud BANG!
Chris stopped the car and we got out. Behind the car was a larger kangaroo lying completely still on the ground.   3  He took off his sunglasses and put them on the kangaroo and did the same with his jacket. Then, he put his arm around the kangaroo and told me to take a photo of them together.  4  While I was focusing(聚焦) the camera, I saw the kangaroo move. It suddenly woke up(醒来), looked at Chris, and jumped away into the distance before we could do anything.
I started laughing(笑) but Chris looked very serious(严肃).   5   I started laughing even harder(更厉害). I stopped laughing, however, when he said that our car keys were also in the jacket!

A. Chris speeded up(加速) to catch up with the kangaroos.
B. He said his wallet and passport(护照) were in the jacket.
C. In order to (为了)get there in three days, we drove very fast.
D. so we had to take food, water, and extra (额外的)gas with us.
E(AB). Chris went over to the kangaroo and put his baseball cap on its head.
F(CD). I was still surprised, but I took out my camera.

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请阅读下面短文。根据短文内容从下面方框内的六个选项中,选择五个还原到文中,使短文意思通顺、结构完整。

A few of years ago, I went to Australia for a meeting with my friend, Chris. We decided to drive across country to Brisbane after the meeting ended(结束). The drive was going to take four days and most of it was across the desert(沙漠),    1   

The first day was a lot of fun as we were excited and laughing at each other's stupid(愚蠢的) jokes. By the third day of driving in the seemingly endless(无边的) desert, we began to get bored. We had been quiet for a few hours when in the distance(在远处) Chris found some kangaroos(袋鼠). We were both excited and decided to get a closer(更近) look.  2  .We got closer and closer, and Chris was doing 110 kilometers per(每) hour. We were very close to the kangaroos—too close—when we heard a loud BANG!

Chris stopped the car and we got out. Behind the car was a larger kangaroo lying completely still on the ground.   3  He took off his sunglasses and put them on the kangaroo and did the same with his jacket. Then, he put his arm around the kangaroo and told me to take a photo of them together.  4  While I was focusing(聚焦) the camera, I saw the kangaroo move. It suddenly woke up(醒来), looked at Chris, and jumped away into the distance before we could do anything.

I started laughing(笑) but Chris looked very serious(严肃).   5   I started laughing even harder(更厉害). I stopped laughing, however, when he said that our car keys were also in the jacket!

A. Chris speeded up(加速) to catch up with the kangaroos.

B. He said his wallet and passport(护照) were in the jacket.

C. In order to (为了)get there in three days, we drove very fast.

D. so we had to take food, water, and extra (额外的)gas with us.

E(AB). Chris went over to the kangaroo and put his baseball cap on its head.

F(CD). I was still surprised, but I took out my camera.

 

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实验室用铜制取硫酸铜,将适量硝酸分多次加入到铜粉与稀硫酸的混合物中,加热使之反应完全,通过蒸发、结晶得到硫酸铜晶体。
(1)为了节约原料,硫酸和硝酸的物质的量之比最佳为:    ;为了吸收该反应中产生的尾气,请选择下列中合适的装置       

(2)为符合绿色化学的要求,某研究性学习小组进行如下设计:
第一组:以空气为氧化剂法
方案1:以空气为氧化剂。将铜粉在仪器B中反复灼烧,使铜与空气充分反应生成氧化铜,再将氧化铜与稀硫酸反应。
方案2:将空气或氧气直接通入到铜粉与稀硫酸的混合物中,发现在常温下几乎不反应。向反应液中加少量FeSO4,即发生反应,生成硫酸铜。反应完全后,加物质甲调节pH ,铁元素全部沉淀(一般认为铁离子的浓度下降到10-5mol·L-1,就认为沉淀完全),然后过滤、浓缩、结晶。
已知:Ksp[Cu((OH)2]≈10-22, Ksp[Fe((OH)2]≈10-16,  Ksp[Fe((OH)3]≈10-38
请回答下列问题:
如开始加入的铜粉为3.2 g,最后所得溶液为500 mL,溶液中含有铁元素0.005 mol。
①方案1中的B仪器名称是       
②为了使铁元素全部沉淀,应调节pH至少为_________。
③方案2中甲物质可选用的是             
A.CaOB.NaOHC.CuCO3D.Cu2(OH)2CO3 E、Fe2(SO4)3
④反应中加入少量FeSO4可加速铜的氧化,用离子方程式解释其原因        
第二组:过氧化氢为氧化剂法
将3.2g铜丝放到45 mL 1.5mol·L-1的稀硫酸中,控温在50℃。加入18mL 10%的H2O2,反应0.5h,升温到60℃,持续反应1 h后,过滤、蒸发浓缩、减压抽滤等,用少量95%的酒精淋洗后晾干,得CuSO4·5H2O 10.5g。
请回答下列问题:
⑤反应时温度控制在50℃~60℃不宜过高的原因是         
⑥本实验CuSO4·5H2O的产率为         

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