问题 问答题 简答题

简述豆乳苦涩味的产生原因及其防止措施。

答案

参考答案:

产生原因:是由于大豆异黄酮、蛋白质水解产生的苦味肽、大豆皂苷等苦涩味物质的存在。

防止措施:在低温下添加葡萄糖酸-δ-内脂,可以明显抑制β-葡萄甘苷酶活性使染料木黄酮和黄豆甙原产生减少。同时,钝化酶的活性,避免长时高温,防止蛋白质的水解和添加香味物质,掩盖大豆异味等措施,都有利于减轻豆乳中的苦涩味。

单项选择题 A2型题
阅读理解

An 11-year-old boy who has been compared to Spanish Impressionist (印象派画家), the great Pablo Picasso, is holding his first exhibition at Llangollen’s Gardening Show this weekend.

Hamad al-Humaidhan, who was born in Kuwait but now lives in Bath, Britain, had no previous knowledge of art history when he first picked up a brush.

But he began to paint his favourite football player, Cristiano Ronaldo, using Picasso’s trademarks (标志) —bright colours and impressionistic forms.

His father said, "I’ve got lots of books about Picasso and I showed them to Hamad but he didn’t know anything about Picasso —it’s just naturally the way he sees it and he just loves to paint."

His first painting of Ronaldo, done when he was just nine, was sold at auction (拍卖) in Bath for £650, which drew the attention of local art businessman Steve Turner. "A colleague sent me some pictures of Hamad’s work and I just couldn’t believe the size of it and how the colours blended (融合) together," he said. "He had talent and I thought Picasso had been reborn.""I’ve shown his work to private art collectors. They liked them very much and everyone was eager to buy, so the first six paintings have been snapped up. I bought two of them myself. The next set of his works will go on show for the first time at Llangollen, which will be the first opportunity for the public to see his amazing talent."

Hamad enjoys maths at school but ranks painting higher. "I think I prefer painting! It makes me relaxed and when I feel tired I just pick up a paint brush," he said. "I just close my eyes and see how it’s going to look and then I just paint it —I paint every day. I just love the colours and I want people to enjoy my paintings."

Now Hamad is nervously waiting for the opening of his exhibition.

小题1:What is the text mainly about?

A.Hamad’s painting exhibition.

B.Hamad and his talent for painting.

C.The popularity of Hamad’s works.

D.The similarities between Hamad and Picasso.小题2:From the text, we can learn that Hamad ________.

A.began to learn painting when he was a boy

B.has read many books about art history

C.likes Cristiano Ronaldo very much

D.knows a lot about Picasso小题3:According to the text, Hamad’s first painting of Ronal-do ________.

A.has bright colours and impressionistic forms

B.was bought by Steve Turner

C.was completed five years ago

D.is his favourite work小题4: What does the underlined phrase "snapped up"in the fifth paragraph probably mean?

A.Shown to the public.

B.Bought very quickly.

C.Cleaned up.

D.Hung up.小题5:What can we learn from the text?

A.Steve Turner speaks very highly of Hamad.

B.Hamad prefers maths to painting.

C.Hamad’s works will be sold after the show.

D.The public can see all Hamad’s paintings at the show.