题目内容
Fruit or juice, which is nutritionally superior? This is almost the same as the age-old question: The chicken or the egg, which came first?
Usually, juicers remove the juice and some pulp (果肉) from fruits and/or vegetables. It takes a lot of fruit to make a container of juice. We do get all of the vitamins, minerals, beneficial plant chemicals and carbohydrates in juice out of a whole fruit. But we do not get much of the fiber, the part that aids our digestive process, fills us up, and may help protect us against heart diseases and certain cancers.
However, you may be surprised to discover that some juices actually contain more necessary nutrients (营养). For example, apples are not a good source of vitamin C, but many types of apple juice are fortified with vitamin C.
Juice typically has more calories than fresh fruit due to added sugar and less fiber. If calories are your primary concern, choose fresh fruit over juice and use water to quench your thirst. You can also look for low-calorie cranberry juice, typically sweetened with sugar substitute. We do not feel as filled up from juice because it does not contain any fiber. For many people, drinking a caloric beverage (饮料), such as juice, is not as satisfying as eating the same amount of calories in food. For those of us who need to increase caloric intake (such as athletes, children, or teens) juice is a GREAT choice.
Kids love the taste of pure fruit juice, and parents love it because it is a healthy source of nutrients. But avoid junk fruit beverages which are mistaken for juice blends that contain various fruits like grape, apple and pear. These juices do not have the natural levels of vital nutrients that 100 percent pure juices like orange juice provide.
56. According to the passage, you’d better have _______ to help prevent heart disease.
A. fruit B. juice C. calories D. minerals
57. What can we learn from this passage?
A. We can get out of fruit all the nutrients which aid our digestive process.
B. We can hardly determine which provides more nutrients, juice or fruit.
C. People may prefer juice to food in taking in the same amount of calories.
D. If you want more calories, fruit might be your better choice.
58. The underlined word “blends” in Paragraph5 probably means “______”.
A. containers B. products C. substitutes D. mixtures
59. The author writes the passage mainly _______.
A. to remind people of negative effects of juice
B. to call on people to drink more juice
C. to help people learn more about fruit and juice
D. to persuade people to avoid junk juice containing various fruits
ABDC
考前必练系列答案Since the beginning of history, man has been attracted by the idea of living forever, of winning the fight against death and disease. So far, this has only remained a dream. Many people have wondered whether it would be possible to find a way to preserve human bodies, and what would be the best way.
It has long been known that meat of fruit can be kept fresh for long periods by freezing; in ancient China, for example, food was stored with ice to keep it fresh. This method could also be useful for preserving humans.
However, most living beings that exist under warm conditions die when frozen. This is because of the harmful effects of freezing ice crystals(晶体), which not only are larger than the volume(体积) of the water originally in the cells, but also form sharp cutting shapes that harm the cells.
In the 1940s Dr B.J. Luyet and a group of scientists in England were working on the problem of freezing cells without damaging them. Since the harm caused by ice crystals was the main cause of damage, Luyet suggested removing some or all of the water from the cells before freezing them.
Using living cells form chicken, Luyet and his assistants discovered that they could partly dry the chicken cells, using a mixture of the white part of an egg and glycerin (丙三醇). Some success was obtained. The chicken cells were dried, frozen for a period of time, and then carefully unfrozen. Almost all the cells recovered when they reached normal temperatures.
Since then, the cooling of whole animals to a temperature far below freezing point for later unfreezing has become more of a possibility, and the glycerin method would probably be used to accomplish this. When this can be done completely and successfully, science will have moved much closer to its aim of freezing and storing incurable patients until the day they can be cured.
【小题1】What does the passage mainly talk about?
| A．Easy but practical ways to remove water from living cells. |
| B．The possibility of preserving human bodies by freezing. |
| C．The practice of preserving food by freezing. |
| D．The harmful effects of freezing. |
| A．has already been realized |
| B．was invented in ancient China |
| C．has its roots in the way of storing food |
| D．is widely accepted by the scientific world |
| A．is harmful to living cells |
| B．is the best way of preserving food |
| C．reduces the volume of water in living cells |
| D．is a way of removing water from living cells |
| A．It is impossible to have whole animals frozen. |
| B．It remains unknown how to unfreeze frozen animals. |
| C．Freezing incurable patients for later treatment is still an idea. |
| D．The glycerin method has already been adopted to treat patients. |