桩冠修复时，一般要求根尖部保留多少长度的根充材料（） A.不用保留 B.1～3mm

白亮污染：是一类光污染，指过度光亮给人的视觉造成的不良影响。如光洁的金属表面、城市里建筑物的玻璃幕墙、釉面砖墙、磨光大理石以及各种涂料等装饰反射光线，明晃白亮、眩眼夺目，使人壮举昏眼花，心烦意乱，食欲下降，情绪低落等身体不适。 下列表述不属于白亮污染的一项是( )。

A．夏天，玻璃幕墙强烈的反光进入附近居民楼房内，增加了室内温度，影响正常的生活

B．烈日下驾车行驶的司机会出其不意地遭到玻璃幕墙反射光的突然袭击，眼睛受到强烈刺激，很容易诱发车祸

C．夜幕降临后，商场、酒店上的广告灯、霓虹灯闪烁夺目，令人眼花缭乱

D．在一些旅游景点，许多人拍照留影，不停闪烁的闪光灯让其他游客心烦意乱

小棘苔藓的皮损特点是

A．针头大的毛囊性丘疹，中央有一根丝状干燥性角质小棘突出

B．可达数毫米，触之柔软

C．皮疹呈红色

D．丘疹可融合成片

E．形成直径<1cm的斑片

Americans like to travel on their yearly holiday. Today, more and more travelers in the United States are spending nights at small houses or inns(客栈)instead of hotels. They get a room for the night and the breakfast the next morning.

Rooms for the night in private(私人的)homes with breakfast have been popular with travelers in Europe for many years. In the past five to ten years, these bed-and-breakfast places have become popular in the United States. Many of these America’s bed-and-breakfast inns have only a few rooms; others are much larger. Some inns do not provide telephones or televisions in the rooms, others do.

Staying at a bed-and-breakfast inn is much different from staying at a hotel. Usually the cost is much less. Staying at an inn is almost like visiting someone’s home. The owners are glad to tell about the areas and the interesting places to visit. Many vacationers say that they enjoy the chance to meet local families.

小题1:Americans take a holiday trip_________.

A．all the year round

B．for years

C．every year

D．every other year小题2:According to the passage, which of the following is NOT true?

A．Some Americans like to stay at bed-and-breakfast homes instead of at hotels.

B．The bed-and-breakfast inns are private homes open to vacationers.

C．The bed-and-breakfast inns have been popular in America for a long time.

D．The bed-and-breakfast inn owners provide a morning meal for their visitors and a room for the night.小题3:Staying at the bed-and-breakfast inns, __________.

A．the travelers needn’t pay anything

B．the travelers don’t have to pay for the telephone or television

C．the travelers can meet and talk with the local people

D．the owners will show the travelers around the area小题4:Which is TRUE according to the passage?

A．European and American vacationers like staying at bed-and-breakfast inns.

B．All Americans enjoy traveling.

C．These bed-and-breakfast inns are all old historic buildings.

D．Staying at a bed-and-breakfast inn is just like at the traveler’s home.

当今世界贸易中，发达国家间的贸易居主导地位，发达市场经济国家同发展中国家问的贸易居于次要地位。( )

将平均表复制为一个名为“统计”的新工作表，筛选出平均成绩80分以上的人，以“统计”为工作表名存在EX7．XLS文件中。