在职攻硕英语考试

【单选题】Earth is believed to ______ by an object the size of Mars at some point in the distant past before its surface cooled.
A．be hit
B．have hit
C．have been hit
D．being hit

【单选题】You’ve probably heard the reports that moderate drinking can actually be good for your heart.But before you stock up (囤积) on beer, wine, or liquor for "medicinal purposes", read the fine print.
Guidelines published by theDepartment of Health and Human Services define moderate drinking as no more than a drink a day for most women and no more than two drinks a day for most men.But even moderate drinking may be ill-advised as you get older.
Research shows that as you age, you absorb alcohol more readily and are more sensitive to its effects. So the number of drinks you could tolerate years ago may be too much for you now. Why First, your body’s ratio of water to fat falls as you age, so there’s less water to dilute (稀释) the alcohol. Second, you have less blood flow to the liver and less efficient liver enzyme action, so your body doesn’t metabolize (新陈代谢) alcohol as readily.
Women need to be especially careful, since most can’t tolerate as much alcohol as men can. One reason is that they are generally smaller, and smaller people have less blood volume, so a little alcohol goes a longer way. Women also produce less of the enzyme that breaks down alcohol in the stomach before it is absorbed into the bloodstream.And they have a higher proportion of body fat, which does not absorb alcohol. The resultDrink for drink, women have 750//00 more alcohol in their bloodstream than men do.
Despite the caveats (警告, 告诫), there’s no doubt that, for many people, limited amounts of alcohol can help you live longer and decrease your risk of heart disease. Those who may be at risk for heart disease or stroke and those who are diabetic appear to benefit most from moderate alcohol intake (one or two drinks per day) over the course of their lifetimes.
For example, in a University of Wisconsin study of diabetic men and women with an average age of 69, the risk of death from coronary heart disease was significantly lower among moderate drinkers compared to abstainers (戒酒者). The death rate for those who had a drink a day was less than half of that for those who didn’t drink at all.
As you get older, ______.
A、you can tolerate more alcohol
B、you have less water in your body
C、your body metabolize alcohol more readily
D、your body becomes more sensitive to alcoholic effects

【单选题】He ______ a well-meant but unsuccessful campaign to ease East-West tensions calling for arms reduction and a summit of the nuclear powers.
A．embarked on
B．reckoned on
C．caught on
D．dwelt on

【单选题】Christmas is the anniversary of the birth ofChrist, generally celebrated onDecember 25. It is one of the chief festivals of theChristian calendar and is (51) a social and family holiday.Christmas customs vary from (52) and among groups of different national (53) In most areas, however, homes and public places are (54) with evergreens,Christmas trees, (55) lights, and glittering ornaments. It is the busiest time of the year for merchants, and shops are filled (56) lavish displays and merchandise of all sorts. People sendChristmas cards and buy gifts for their families and friends.Children look forward to (57) SantaClaus. They (58) their stockings onChristmas (59) and onChristmas morning they discover the gifts that have been left for them during the night. In the afternoon, families gather to (60) presents and to share the traditionalChristmas dinner.
A、place to place
B、one to another place
C、a place to another place
D、one place to another place

【单选题】孩子连续弹奏钢琴30分钟，父母允许他看电视10分钟，这种强化属于()
A．定比间隔强化
B、定时间隔强化
C、不定比间隔强化
D、不定时间隔强化。