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问题 选择题

我国的人口增长模式从过去高出生率、低死亡率、高增长率的“高、低、高”的模式，很快过渡到目前的低出生率、低死亡率、低增长率的“低、低、低”的模式，主要原因是[ ]

A．实行计划生育

B．经济迅速发展

C．自然条件好

D．人口基数大

答案

答案：A

单项选择题

急性梗阻性化脓性胆管炎的典型症状是

A．腹痛、黄疸、呕吐、高热、昏迷、休克

B．腹痛、黄疸、寒战、高热、休克、昏迷

C．腹痛、黄疸、腹胀、高热、昏迷、休克

D．腹痛、寒战、呕吐、高热、休克、昏迷

E．寒战、高热、黄疸、呕吐、昏迷、休克
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单项选择题

"Clean your plate!" and "Be a member of the clean-plate club!" Just about every kid in the US has heard this from a parent or grandparent. Often, it’s accompanied by an appeal. "Just think about those starving orphans (孤儿) in Africa!"
Sure, we should be grateful for every bite of food. Unfortunately, many people in the US take a few too many bites. Instead of saying "clean the plate," perhaps we should save some food for tomorrow.
According to news reports, US restaurants are partly to blame for the growing bellies (肚子). A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story.
Americans traditionally associate quantity with value and most restaurants try to give them that. They serve large portions to stand apart from competitors and to give the customers value. They prefer to have customers complain about too much food rather than too little.
Barbara Rolls, a nutrition professor at Pennsylvania State University, told USA Today, that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand.
Health experts have tried to get many restaurants to serve smaller portions. Now, apparently, some customers are calling for this too. A restaurant industry trade magazine reported last month that 57 percent of more than 4 000 people surveyed believed restaurants serve portions that are too large; 23 percent had no opinion; 20 percent disagreed.
But a closer look at the survey indicates that many Americans who can’t afford fine dining still prefer large portions. Seventy percent of those earning at least $150 000 per year prefer smaller portions, but only 45 percent of those earning less than $ 25 000 want smaller.
It’s not that working class Americans don’t want to eat healthy. It’s just that, after long hours at low-paying jobs, getting less on their plate hardly seems like a good deal. They live from paycheck to paycheck, happy to save a little money for next year’s Christmas presents.

By saying "Be a member of the clean-plate club!" (Para.1) a parent or grandparent is asking the children to ______.

A. wash dishes after meals
B. eat all the food on their plate
C. save food for the starving Africans
D. reserve food for the future
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