have all the essential amino acids
are manufactured by the body
can mix with other proteins to form complete proteins
can be gained from meat, fish, eggs, and milk
第1题:
A、would have enjoyed
B、shouldn't have enjoyed
C、needn't have enjoyed
D、can’t have enjoyed
第2题:
We get energy from the foods we eat.Our food supplies energy to keep our organs working.Our food also supplies heat to warm our bodies.
The main energy foods are the carbohydrates (碳水化合物).These are the sugars and starches(淀粉). Wheat and rice are rich in starch and many fruits and vegetables contain considerable amount of sugar. Sweets, honey and jam are also rich in sugar.
Like carbohydrates, fats are food that provides us with energy. Butter, margarine, certain types of fish, eggs, cooking oils and most red meats are rich in fats. Fats can be stored in various parts of the body as reserves of energy. Because fats in general are slowly digested, they satisfy hunger for long periods.
Proteins (蛋白质) are very complex substances. The body needs proteins for the growth of new cells and for the repair and replacement of old cells. Foods rich in proteins are essential to a balanced diet. Milk, some vegetables, meat, chicken, fish, cheese, grains and nuts are some foods rich in proteins.
A good diet will contain a variety of foods so that the body contains all the minerals it needs for good health.
Vitamins are necessary for the proper working of the body. If we eat a variety of foods, we can be sure of obtaining all the vitamins we need.
Water makes up about 70 per cent of the weight of the human body. The average adult needs about two liters of water daily to replace the water the body loses.
1.Of the following substances, which are not used as sources of energy by living things?()
A. Starches
B. Vitamins
C. Proteins
D. Fats
2.If equal weight of the following substances is “burned” in the body,
A. carbohydrates
B. fats
C. vitamins
D. mineral salts
3.A boy grows five centimeters a year.The new material
A. fats
B. vitamins
C. proteins
D.carbohydrates
4.Which of the following is not true?()
A. If a man weighs 150 pounds, 105 pounds are water.
B. Apple, butter and meat are rich in proteins.
C. A well-balanced diet contains proteins, fats, minerals and vitamins.
D. Biscuits, cake and sweets may provide us with energy.
5.People can get all the minerals the body needs by().
A. having a balanced diet
B. drinking more milk
C. eating fruits and vegetables
D. having more fish and eggs
第3题:
Which of the following is NOT true_________?
A. People may have more healthful food at McDonald's.
B. Scientists can control levels and types of substances to grow meat in labs.
C. Lab meat is less likely to be polluted like other kinds of meat.
D. It will not be long before lab meat is available in supermarkets.
第4题:
第5题:
Which of the following statements can best be inferred from the passage?
A. Fishes only "speak" to communicate with each other.
B. Researches are now being made to study the significance of fish sounds.
C. Sea animals have a sharper hearing ability than men.
D. Sounds made by fish cannot be transmitted through the air.
第6题:
Milk contains rich proteins, and many people have it for lunch.
第7题:
A. All OSPF routers in stubby areas can have type 3 LSAs in their database.
B. All OSPF routers in stubby areas can have type 7 LSAs in their database.
C. All OSPF routers in totally stubby areas can have type 3 LSAs in their database.
D. All OSPF routers in totally stubby areas can have type 7 LSAs in their database.
E. All OSPF routers in NSSA areas can have type 3 LSAs in their database.
F. All OSPF routers in NSSA areas can have type 7 LSAs in their database.
第8题:
Why do the depository institutions have the fractional reserve banking?
A.Because they can keep a large amount of deposits from their depositors in the form. of reserves.
B.Because most of their depositors would withdraw their deposits.
C.Because only a small fraction of their depositors would deposit money during a day or week.
D.Because they can meet the need of withdrawing of their depositors and make investments in other financial assets.
第9题:
第10题: