下列有关免疫的叙述，正确的是（）。 A．过敏原首次进入机体不会引起过敏反应 B．记忆

儿童胃食管反流饮食原则错误的是（）

A.少量多餐

B.稀薄食物

C.睡觉前不进食

D.少食脂肪饮食

E.少吃或不吃巧克力

从1938年底开始，日军大举进攻敌后抗日根据地，这表明日本侵略者对中共领导的抗日武装实行[ ]

A．军事恐 吓政策

B．政治诱降为主、军事打击为辅的方针

C．军事消灭方针

D．经济封锁为主、军事打击为辅的方针

The custom of celebrating from the end of January until mid-February has long been popular in Quebec City, Canada. The first large Winter Carnival here, in the world’s snow capital, took place in 1894. Faced with winter’s hardships, the city’s population made this popular tradition into a winter celebration that warmed the hearts of all people.

Interrupted by two wars and then the economic crisis of 1929, the Carnival was held from time to time until the second half of the century. In 1954, a group of business people re-started the festivities. That year, Bonhomme was born and was elected the event’s representative.

The next year the first official Quebec Winter Carnival took place. The Carnival snowballed into a big event and was important for tourism and economic activity in the city.

From one winter to the next, the Carnival enriched its activity program. We have since added even more popular activities, such as winter sports, snow sculptures, and activities based on the traditional Quebec lifestyle, such as dogsled races. The Quebec Winter Carnival is the largest winter carnival in the world today, and is third on the list of Top Carnivals after the famous carnivals in Rio and New Orleans.

1960

The people living along Rue Sainte-Therese created many snow or ice sculptures, and this location became known as Carnival Street.

1964

The name of Bonhomme Carnival and his image became registered trademarks.

1970

A new tradition was born: closing the event with a firework display.

1975

A new activity, called The Break, was created, on Friday from noon till midnight. Many employers gave their employees time off so they could go dancing at the Quebec City Convention Centre. The event continued to be held until 1986, sometimes late into the night.

1977

Until 1991, the Carnival offered a children’s sculpture competition.

1987

The snow bath became part of the program.

1999

Because of the importance of volunteers, the human resources department was created to improve organization.

小题1:The Quebec Winter Carnival     .

A．is held from mid-February to the end of March

B．is an encouragement for the local people in winter

C．is the second largest carnival in the winter

D．has as many activities as when it was first held小题2:

小题3:

小题4:

下列关于预应力砼桥梁施工的规定正确的是（）。

A、砼的水泥用量不宜超过500kg/m3，最大不超过550kg/m3； 

B、悬臂施工中挂篮行走时和砼浇注时的稳定系数不小于1.5； 

C、预应力束张拉实际伸长量与理论伸长量之差应在6％以同； 

D、后张法施工中，每个断面断丝之和不超过该断面钢丝总数的2％； 

E、孔道压浆所用水泥浆的泌水率不超过4％。