What are the effects of alloying elements on the properties of steel？合金元素对钢的性能有哪些影响？

Because of the effects of an electromagnetic field on growing cells, ______ are the ones who easily fall victim to its effects.

The following are the basic functions of a bill of lading except to act as______.

A．a receipt for the goods from the shipping company to the exporter

B．a certificate of origin, which certifies mat the goods were produced in a particular country

C．a document of title for goods being shipped overseas

D．evidence of the carriage contract between the exporter and the carrier

A.A scheduler contains parameters that describe how a queue should be serviced.

B.A scheduler contains traffic that is ready to be transmitted.

C.A scheduler contains forwarding classes that allow traffic to be forwarded.

D.A scheduler contains a map between the classification of a packet and its forwarding class.

Our species evolved on the move. Recent research on the effects of exercise and the consequences of sedentary living has shown that physical activity is crucial to the proper processing of foods that we eat. In fact, most of the chronic and often life-threatening ailments that besiege Americans in epidemic proportions could be tempered by regular exercise. Among them are heart disease, diabetes, high blood pressure, arthritis, and osteoporosis. But let's face it: most people are not motivated to exercise by what it may do for them 20 years down the pike. What gets people like me out moving every day is what exercise does for me right now, especially how it allows me to enjoy eating without gaining. I, along with millions of Americans, have discovered that exercise is the key to permanent and painless weight control.

After hearing a description of my usual daily exercise schedule--a morning run or bike ride and an evening swim, sometimes with an hour of tennis in between-some people remark, "Wouldn't it be a lot easier to eat one less bagel a day and skip all that exercise?" My answer is, "Easier, yes, but not nearly as effective nor as much fun." Here's why exercise, not dieting, is best route to a leaner, lighter you.

Far better for your health and, your future to lose primarily fat is in the first place. The only way to do that is through exercise, which uses body fat as its main source of energy. You may not see that initial rapid (but false) weight loss, but what you lose will be what you want to lose--fat, not muscle or water. Your loss will be permanent, too. If it' s any consolation (安慰), studies have shown that in most cases, the faster people lose weight, the more likely they are to regain it. Slow loss, then, is the secret to lasting success.

If you want to lose weight faster than you can with just exercise, simply combine exercise with a reduced-calorie diet. Researchers at the University of California, Davis, showed that exercise could counter the metabolism-lowering effect of a low-calorie diet in many people, it also seems to curb the adverse caloric effect of aging on body metabolism. Whereas ordinarily your metabolism would slow down as you get older (which is one reason people get fatter in middle age even though they don't eat more), if you continue to exercise regularly, you may keep your youthful, metabolic rate by maintaining a muscular body instead of losing muscle and putting on pounds of fat.

What can be inferred from the passage?

A．The slower people lose weight, the less likely they are to achieve their goals.

B．People who are on diet merely lose muscle and water.

C．Regular exercises may reduce the chance of getting certain chronic diseases.

D．Physical activity use muscle tissue as its main source of energy.

What can be said of the normal process of aging, from a linguistic point of view? In general (1)_____, there is a clear and (2)_____ relationship: no-one would have much difficulty (3)_____ a baby, a young child, a teenager, a middle-aged person, or a very old person from a tape recording. With children, (4)_____ is possible for specialists in language development, and people experienced (5)_____ child care, to make very detailed (6)_____ about how language correlates with age in the early years. (7)_____ is known about the patterns of linguistic change that affect older people. It is plain that our voice quality, vocabulary, and style. alter (8)_____ we grow older, but research (9)_____ the nature of these changes is in its earliest stages. However. a certain amount of (10)_____ is available about the production and (11)_____ of spoken language by very old people, especially regarding the phonetic changes that take place.

Speech is (12)_____ to be affected by reductions in the (13)_____ of the vocal organs. The muscles of the chest (14), the lungs become less elastic, the ribs (15)_____ mobile: as a result, respiratory efficiency at age 75 is only about half (16)_____ at age 30, and this has (17)_____ for the ability to speak loudly, rhythmically, and with good tone In addition, speech is affected by poorer movement of the soft palate and changes in the facial skeleton, especially around the mouth and jaw. There are other, more general signs of age. Speech rate slows, and fluency may be more erratic. Hearing (18)_____, especially after the early fifties. Weakening (19)_____ of memory and attention may affect the ability to comprehend complex speech patterns. But it is (20)_____ all had news: vocabulary awareness may continue to grow, as may stylistic ability—skills in narration, for example. And grammatical ability seems to be little affected.

A．speech

B．terms

C．ways

D．cases

What are the side-effects of amphetamines?

What are the forms of advertising?