1) (使)加速.速度 2) 千米.公里 3) 穿越過.十字形的東西 4) 燈光.光亮.光.淺色的.輕的.點(diǎn)燃 5) 錯(cuò)過.思念 6) 傷害 7) 當(dāng)--的時(shí)候.什么時(shí)候 8) 轉(zhuǎn)彎.轉(zhuǎn)變.輪流的順序 9) 橋 10) 事故.意外的事 11) 小山.丘陵 12) 死 13) 更換.改變.零錢.找頭 14) 晚的 15) 公眾(的).公共的 16) 危險(xiǎn) 17) 規(guī)則.規(guī)定.統(tǒng)治.支配 18) 夫人.太太 19) 橫穿過 20) 小心的.仔細(xì)的 21) 會(huì).應(yīng)當(dāng).應(yīng)該 22) 沿著 23) 快的 24) 在--之前.在--前面 25) 米.公尺 26) 直到--為止 27) 票券.單 28) 使用.利用 29) certainly 30) obey 31) cleaner 32) sidewalk 33) crosswalk 34) straight 查看更多

 

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請(qǐng)閱讀下面短文。根據(jù)短文內(nèi)容從下面方框內(nèi)的六個(gè)選項(xiàng)中,選擇五個(gè)還原到文中,使短文意思通順、結(jié)構(gòu)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(結(jié)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(無邊的) desert, we began to get bored. We had been quiet for a few hours when in the distance(在遠(yuǎn)處) 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(醒來), looked at Chris, and jumped away into the distance before we could do anything.
I started laughing(笑) but Chris looked very serious(嚴(yán)肅).   5   I started laughing even harder(更厲害). 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(護(hù)照) were in the jacket.
C. In order to (為了)get there in three days, we drove very fast.
D. so we had to take food, water, and extra (額外的)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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請(qǐng)閱讀下面短文。根據(jù)短文內(nèi)容從下面方框內(nèi)的六個(gè)選項(xiàng)中,選擇五個(gè)還原到文中,使短文意思通順、結(jié)構(gòu)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(結(jié)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(無邊的) desert, we began to get bored. We had been quiet for a few hours when in the distance(在遠(yuǎn)處) 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(醒來), looked at Chris, and jumped away into the distance before we could do anything.

I started laughing(笑) but Chris looked very serious(嚴(yán)肅).   5   I started laughing even harder(更厲害). 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(護(hù)照) were in the jacket.

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

D. so we had to take food, water, and extra (額外的)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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實(shí)驗(yàn)室用銅制取硫酸銅,將適量硝酸分多次加入到銅粉與稀硫酸的混合物中,加熱使之反應(yīng)完全,通過蒸發(fā)、結(jié)晶得到硫酸銅晶體。
(1)為了節(jié)約原料,硫酸和硝酸的物質(zhì)的量之比最佳為:    ;為了吸收該反應(yīng)中產(chǎn)生的尾氣,請(qǐng)選擇下列中合適的裝置       。

(2)為符合綠色化學(xué)的要求,某研究性學(xué)習(xí)小組進(jìn)行如下設(shè)計(jì):
第一組:以空氣為氧化劑法
方案1:以空氣為氧化劑。將銅粉在儀器B中反復(fù)灼燒,使銅與空氣充分反應(yīng)生成氧化銅,再將氧化銅與稀硫酸反應(yīng)。
方案2:將空氣或氧氣直接通入到銅粉與稀硫酸的混合物中,發(fā)現(xiàn)在常溫下幾乎不反應(yīng)。向反應(yīng)液中加少量FeSO4,即發(fā)生反應(yīng),生成硫酸銅。反應(yīng)完全后,加物質(zhì)甲調(diào)節(jié)pH ,鐵元素全部沉淀(一般認(rèn)為鐵離子的濃度下降到10-5mol·L-1,就認(rèn)為沉淀完全),然后過濾、濃縮、結(jié)晶。
已知:Ksp[Cu((OH)2]≈10-22, Ksp[Fe((OH)2]≈10-16,  Ksp[Fe((OH)3]≈10-38
請(qǐng)回答下列問題:
如開始加入的銅粉為3.2 g,最后所得溶液為500 mL,溶液中含有鐵元素0.005 mol。
①方案1中的B儀器名稱是       。
②為了使鐵元素全部沉淀,應(yīng)調(diào)節(jié)pH至少為_________。
③方案2中甲物質(zhì)可選用的是             。
A.CaOB.NaOHC.CuCO3D.Cu2(OH)2CO3 E、Fe2(SO4)3
④反應(yīng)中加入少量FeSO4可加速銅的氧化,用離子方程式解釋其原因        。
第二組:過氧化氫為氧化劑法
將3.2g銅絲放到45 mL 1.5mol·L-1的稀硫酸中,控溫在50℃。加入18mL 10%的H2O2,反應(yīng)0.5h,升溫到60℃,持續(xù)反應(yīng)1 h后,過濾、蒸發(fā)濃縮、減壓抽濾等,用少量95%的酒精淋洗后晾干,得CuSO4·5H2O 10.5g。
請(qǐng)回答下列問題:
⑤反應(yīng)時(shí)溫度控制在50℃~60℃不宜過高的原因是         ,
⑥本實(shí)驗(yàn)CuSO4·5H2O的產(chǎn)率為         。

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