单项选择题：《规程》规定：生产矿井采掘工作面不得超过（）°C。A、20 B、26 C、30 D、

题型：填空题

某班一学习小组以“关于市场上几种补钙保健产品的调查研究”为课题进行了探究学习活动。

【收集资料】(1)通过市场调查，常见的四种钙产品的有关信息如下：

品名	钙尔奇D	凯思立D	乐力钙	枸橼酸钙
主要含钙物质	碳酸钙	碳酸钙	碳酸钙	枸橼酸钙
钙元素含量 (mg/片)	600	500	250	168
数量(片/瓶)	30	20	30	30
价格(元/瓶)	27.00	23.10	30.00	25.20

(2)通过查阅资料，收集到如下信息：生长期青少年每天钙摄入量应为1 300 mg，而实际上目前我国中学生每日钙摄入量的均值为518 mg，营养学会公布的居民每日钙摄入量为800 mg。

【研究结论】(1)钙保健产品中钙元素以______形式存在。

A.单质 B.化合物

(2)人体的钙元素主要存在于________中。

(3)根据上述调查信息分析，青少年每日钙需求量大，而实际摄入量不足，应注意________。

【交流与讨论】(1)上述四种钙产品中，当含有相同的钙元素时，________价格相对便宜。

(2)交流过程中，小芳同学提出一个观点，补钙可以食补。下列做法可以补钙的是______________________。

A.在食物中添加生石灰

B.食用一些虾皮

C.喝排骨汤

D.做馒头时放纯碱

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题型：单项选择题

Directions: There are 4 passages in this part. Each of the passages is followed by 5 ques tions or unfinished statements. For each of them there are 4 choices marked A, B, C and D.
Passage One

People in the mass advertising business and others who study American society have been very interested in the question: What does the American consumer like Max Lerner, a well-known scholar who has studied American society, has said that American consumers are particularly fond of three things: comfort, cleanliness, and novelty.
Lerner believes that the American love of comfort perhaps goes back to the frontier experience, where life was tough and there were very few comforts. This experience may have created a p desire in the pioneers and their children for goods that would make life more comfortable. Today, the American’s love of comfort is seen in the way they furnish their homes, design their cars, and travel. How Americans choose a new mattress for their bed is an example of the Americans love of comfort. Many Americans will go to a store where beds are set up, and they will lie down on several mattresses to see which one is the most comfortable.
Cleanliness is also highly valued by Americans. There is a p emphasis on keeping all parts of the body clean, and Americans see lots of TV commercials for soap, shampoo, deodorants, and mouthwash: Perhaps the Puritan (清教徒的) heritage has played some role in the desire for cleanliness. The Puritans, a strict Protestant (新教的) church group who were among the first settlers of America, stressed the need to cleanse the body of dirt and of all evil tendencies, such as sexual desire. The saying "Cleanliness is next to Godliness" reflects the belief of most Americans that it is important to keep not only their bodies, but also their clothes, their houses, their cars, and even their pets clean and smelling good. Indeed, many Americans are offended by anyone who does not follow their accepted standards of cleanliness.
Along with cleanliness and comfort, Americans love having things that are new and different. Perhaps this love of novelty comes from their pride in their inventiveness. American have always been interested in inventing new products and improving old ones. They like to see changes in cars, clothing, and products for the home. Advertisements encourage people to get rid of old products and try new ones, whether the old ones still work or not. And if they cannot afford to buy something now, advertisers encourage consumers to charge it on a credit card. "Buy now— pay later. "

According to the passage, Americans take pride in their ______.

A．standards of cleanliness

B．inventiveness

C．old products

D．comfortable life

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题型：选择题

【要】下列各选项中解释错误的一项是（）

A．虽与府吏要，渠会永无缘《孔雀东南飞》（相约，誓约）

B．东割膏腴之地，北收要害之郡《过秦论》（险要）

C．张良出，要项伯《鸿门宴》（同"邀"，邀请）