问题 选择题

有Mg、Al混合物粉末10.2 g溶于50.0 mL 4 mol·L-1的盐酸里,若加入2 mol·L-1的氢氧化钠溶液,使得沉淀达到最大量,则需加入此种氢氧化钠溶液的体积为(    )

A.100 mL

B.500 mL

C.1000 mL

D.1500 mL

答案

答案:A

根据化学方程式,仅当溶液中只存在NaCl时,镁、铝全部以Mg(OH)2、Al(OH)3沉淀,沉淀达到最大值,亦即当n(NaOH)=n(HCl)时,沉淀量最多。

阅读理解

A Swedish man was dug out alive after being snowed in his car on a forest track for two months with no food, police and local media reported on Saturday.

The 45-year-old from southern Sweden was found on Friday, February17, too weak to say more than a few words.

He was found not far from the city of Umea in the north of Sweden by snowmobilers who thought they had come across a ruined car until they dug their way to a window and saw movement inside.

The man, who was lying in the back seat in a sleeping bag, said he had been in the car since December 19.

“Just incredible that he’s alive considering that he had no food, but also since it’s been really cold for some time after Christmas.” a rescue team member told regional daily Vasterbottens- Kuriren, which broke the news.

Ebbe Nyberg, duty officer at the Umea police, said police saw no reason to doubt that the man had been stuck in the car for a very long time.

“We would not make up something like this. The rescue services were on site too and saw the same as us.” he told Vasterbottens-Kuriren.

Umea University Hospital, where the man is recovering after being rescued by police and a rescue team, said in a statement he was doing well considering the circumstances.

Doctors at the hospital said humans would normally be able to survive for about four weeks without food. Besides eating snow, the man probably survived by going into a dormant-like(休眠似的)state, physician Stefan Branth told Vasterbottens-Kuriren.

“A bit like a bear that hibernates. Humans can do that.” he said. “He probably had a body temperature of around 31 degrees which the body adjusted to. Due to the low temperature, not much energy was used up.”

“Why the man ended up under the snow in the forest remains unknown,” police said.

小题1:Who found the Swedish man in the snow?

A.Snowmobilers.

B.The police.

C.A rescue team.

D.Local people.小题2:“Police saw no reason to doubt that the man had been stuck in the car for a very long time.” implies that     .

A.police didn’t think it true

B.police were sure of the fact

C.police had some doubt on the fact

D.police had reasons to doubt the fact小题3:The reason why the man could survive was most probably that     .

A.he was only forty-five year old

B.he did not use any energy

C.he slept in the sleeping bag

D.he was in a dormant-like state小题4:Which is the correct order of the following events?

a.The Swedish man was stuck in the snow.

b.He was sent to Umea University Hospital.

c.He was found by snowmobilers.

d.He was recovering after treatment.

e.He stayed in his car for nearly two months.

f.He was dug out by people.

A.e, a, c, d, f, b

B.a, e, c, f, b, d

C.a, f, c, e, b, d

D.e, c, f, a, d, b小题5:Which of the following can be the best title of the passage?

A.A Traffic Accident

B.A Long Sleep in Winter

C.An Incredible Survival

D.A Successful Rescue

单项选择题