钢笔一甩，墨水就被甩出，这是由于墨水具有　　，钢笔吸墨水是利用　大气压　作用，把

将一条鱼放在装有清水的容器中，它的口和鳃盖后缘不停的交替张合，这时它正在 [ ]

A．喝水　　

B．找食物　　

C．玩耍　　

D．呼吸

依次填入下列各句横线处的词语，最恰当的一组是 ( ) ①大楼里没有鼠患，______不养猫，老鼠也不会上门。 ②______教练指导正确，因此大家的成绩提高得相当快。 ③近日连续降雨，造成了李家沟山洪______。 ④家长教育孩子要注意方法，不要______孩子的自尊。

A．即使 由于 暴发 伤害

B．即使 因为 爆发 损害

C．如果 由于 暴发 损害

D．如果 因为 爆发 伤害

海水中有取之不尽的化学资源，从海水中可提取多种化工原料，下图是某工厂对海水资源的综合利用的示意图：

回答下列问题：

（1）操作A的实验名称为：   ▲   ，B的化学式为   ▲   

（2）镁是活泼的金属，能在二氧化碳中燃烧，反应方程式为：       ▲            

决策所涉及的外部因素具有较大的可控性，因此能在一定程度上依据可控因素进行投资决策分析，这种决策方法是（）。

A、确定型投资决策

B、风险型投资决策

C、多元性投资决策

D、常规投资决策

Like all the huge metropolises of the world, there are lots of diversions both outdoors and indoors in Chicago. The Art Institute of Chicago has one of the world’s (1) art collections, including more French Impressionist paintings than even in the Paris Louvre itself. The Field Museum of Natural History and the Museum of Science and Industry are also great historical and cultural treasure houses to (2) as well as entertain children and adults (3) In the Field Museum one comes (4) a surprisingly big collection of Chinese exhibits from the ancient (5) to the early century. The Sears Tower and the Buckingham Fountain are the pride of the Chicagoans; (6) having 110 storeys is said to be the highest tower in the world and the (7) is the largest fountain in the United States. Lake Michigan is for yachting in summer time, (8) the highlights of Chicago life all the year round are concerts, operas and plays (9) by the city’s orchestra, opera houses and theatres. In summer, especially around the Independence Day, July 4th, many festivals and fairs are given outdoors, which, (10) crowds and crowds of people, with their parades, fireworks, (11) concerts, water-skiing and good foods.

But with all its attractions and beautiful spots Chicago is also a city (12) for crimes. All the dwelling houses are (13) with three doors and visitors have to speak through microphone (14) in the wall to the residents before they can get admitted. In the streets there are white-color telephones. When one finds oneself (15) , he needs only to knock the receiver (16) the hook and the next instant the police will (17) . If one does not drive a car, it may well be dangerous for him or her to go out alone in the evening. At first I did not take this warning seriously. (18) , my two encounters with the Black people (19) dusk in the neighborhood were so unpleasant and frightening that I have (20) shut myself evenings in my room, in almost all studying, imposing a curfew on myself.

4（）

A.upon

B.to

C.with

D.for