双缩脲反应中产生的紫色络合物颜色的深浅与蛋白质浓度成正比，而与蛋白质分子量及氨基酸成分无关，故可用来测定蛋白质含量。
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What are the services that a local guide should offer in food and beverage?
A. On the way to the restaurant, the local guide should introduce the local special culinary characteristics.
B. The local guide can tell all the process of cooking.
C. The local guide should know the famous restaurants.
D. On arrival, the local guide should lead the tour group to the seats.
E. The local guide should inform the waiters of the special requirements.
F. During the meal, the local guide should go to the tourists several times.
Chinese cuisine has changed in each region according to .
A. climate
B. imperial fashion
C. religion
D. local preferences
E. ethnic background
What does Sichuan cuisine use for cooking?
A. Garlic.
B. Fruits.
C. Vinegar.
D. Chilli pepper.
Do you think where the tourists come from in Xiaobai’s group?
A. England
B. America
C. Australia
D. Canada
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