单项选择题

According to the first paragraph, gelatin________.

A．is a protein that can be obtained from animals
B．is harmful to human bodies
C．should not be made into a dessert
D．is lacking in tryptophan and arginine

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热门试题

单项选择题

The best title for this passage might be________.

A．Chinese Cooking Style
B．Differences between Proteins
C．How to Take Proteins Scientifically
D．How to Avoid Heart Disease

单项选择题

It can be concluded that the difference between complete proteins, partially complete proteins and incomplete proteins lies in________.

A．the amount of essential amino acids
B．the types of essential amino acids
C．the amount of lysine
D．the combinations of amino acids