问题 问答题 简答题

酸乳凝固不良或者不凝固的原因有哪些,怎样解决?

答案

参考答案:

①原料乳质量;乳中含有抗菌素、防腐剂,会抑制乳酸菌生长,影响正常发酵,从而导致酸乳凝固性差;原料乳掺水,使乳的总干物质含量降低;掺碱中和发酵所产的酸,都会造成酸乳凝固不好。

②发酵温度与时间;发酵温度与时间低于乳酸菌发酵的最适温度与时间,会使乳酸菌凝乳能力降低,从而导致酸乳凝固性降低。另外,发酵室温度不均匀也会造成酸乳凝固性降低。

③发酵剂活力;发酵剂活力减弱或接种量太少会造成酸乳凝固性差。

④加糖量;加糖量过大,产生高渗透压,抑制了乳酸菌的生长繁殖,也会使酸乳不能很好凝固。

阅读理解

YUXI, China — Many people of this city in southwester China spent Saturday night in tents, too scared to sleep in their homes after an earthquake which killed 188 people early that morning.

Countless homes were destroyed and lots of people became homeless after the earthquake which is believed to have a magnitude of 7.

The quake was not as serious as the 7.9-magnitude earthquake in 2008 that left more than 70,000 people dead in the Wenchuan area. But villagers who work in Chengdu, about 100 miles away, hurried back home Sunday morning, many on foot, the lucky ones on motorbikes, to check on their homes.

Song Yuanqing, 43, a worker, arrived back after a 22-hour trip and found his house was still there but had already been very unstable(摇摇欲坠). “We would like to do something, but we can’t do anything,” Mr. Song said as he sat with neighbors around an outdoor fire built by the village leader in his backyard.

In all, the government sent about 7,000 soldiers and People’s Armed Police officers to the earthquake-hit area. By Saturday evening, there were so many rescue workers in the area that the government asked volunteers to stop coming.

Li Keqiang, China’s prime minister, flew to the area and slept in a tent on Saturday evening in Lushan County.

The earthquake shook Sichuan Province at 8 a.m., when people were getting up a little later than usual because schools and universities were closed.

“We were just getting up and getting dressed in our dormitory when the building shook, and I looked outside from our window and saw a row of houses had collapsed,” Xu Yan, 22, a student at the Agricultural University in Ya’an, said in a telephone interview. “I had never flew down the stairs faster.”

The Chinese government said early Sunday that the death toll was 174, and about 5,700 people had been injured.

The earthquake was also felt in Chengdu, one of China’s biggest cities and the capital of Sichuan Province. People described water getting out of home aquariums and things like balls falling to the floor.

In the town of Longmen, another hard-hit area near Ya’an, a local man, Zhang Yan, said 90 percent of the buildings had collapsed.

“About 100 people died around here,” Ms. Zhang said in a telephone interview. “Rescue teams have not yet arrived. There is no water or electricity.”

In the 2008 quake, many schools of poor quality collapsed and killed thousands of students. This time, many people also expressed their worries about students on their micro-blogs.

Sichuan Province is also one of China’s best-known hometowns for pandas, and at the Bifengxia reserve, about six miles north of Ya’an, workers said that 20 pandas in the park were safe. “We examined the panda area after the quake, and they were not affected,” said Chen Yong, an officer of the reserve.

小题1:When did the quake take place in Ya’an? On_______________________.

A.Saturday morning

B.Sunday morning

C.Saturday night

D.Sunday night小题2:Why did many people hurriy home after the earthquake.

A.They wanted to provide rescue to the hit area and give other people a helping hand as volunteers.

B.They wanted to find out the situation of their home.

C.They felt it too dangerous to stay where they had been.

D.There weren’t enough soldiers in the hit-area.小题3:What does the underlined sentence mean?

A.Xu Yan didn’t make it through the stairs.

B.Xu Yan get out of the dorm quickly.

C.Xu Yan felt the earthquake shaking the stair.

D.Xu Yan was scared that he wouldn’t be able to catch up with the stair.小题4:Which of the following is NOT true.

A.Tens of thousands of students were killed in Ya’an.

B.The earthquake also influenced some other cities.

C.The government took very quick actions.

D.Most buildings has collapsed in Longmen.小题5:Where would you most probably read this passage?

A.Reader.

B.A History of China’s Earthquakes

C.How to Survive(求生) in an Earthquake

D.China Weekly

填空题