44-47為題組
In the last several decades, the western world has been rediscovering the soybean, a plant whose use dates before recorded history in Asia. For thousands of years, the Chinese have valued highly the soybean, considering it one of the five important grains (along with rice, millet, barley, and wheat). Since it is cheap to produce and rich in protein, and has many uses, the soybean could provide food to the world’s growing population. Besides, soybeans can be fed to a variety of other animals ranging from livestock to silk worms.
The soybean is an almost perfect source of protein. If you are a vegetarian, or if your diet includes little meat, soy protein is a good alternative, and may even be essential to maintaining your health. The soybean’s high fiber content is beneficial in preventing digestive disorders. The soybean is free of cholesterol, and more importantly, the soy oil contains some special substances, called Omega 3 fatty acids, which reduce cholesterol and prevent blood from clotting in human body. Research shows that consuming a minimum of 25 grams of soy protein a day can lower blood cholesterol levels in people with high cholesterol problems.
In view of all these strengths, in the 1930s the United States and Canada undertook a research project in which they managed to breed an especially nutritious soybean with a high oil content. Since then, the United States has become the world’s largest producer of soybeans and has exported much of its soybean produce. In recent years, the soybean has been used in making many different foods and has become the atom of health food. Health-conscious Americans are adding tofu, the most popular soybean product, to salads and using it as a meat substitute. In the health food stores of major cities, it is now possible to buy tofu burgers and even tofu hot dogs.
【題組】47. According to the passage, which of the following statements is true?
(A) Tofu is a rich protein source.
(B) Soybean protein prevents digestive problems.
(C) The United States exports most of its soybean produce to Canada.
(D) Vegetarians should eat less than 25 grams of soy protein every day.
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