一小球自45m高的塔顶自由下落，若取g═10m/s2，则小球下落过程中最后1s内

In information theory, "information" is regarded as knowledge which reduces or removes (71) about the occurrence of a specific event from a given set of possible events. The concept "event" is to be understood as used in the theory of probability. For instance, an event may be the occurrence of a (72) character or word in a given message or in a given position of a message.

In communication theory, channel is defined as that part of a communication system that connects the message source with the message sink. An encoder may be inserted between the message source and the input to the channel, and a (73) between the output of the channel and the message sink. Generally, these two units are not considered as being parts of the channel. In certain cases, however, they may be considered as pans of the message source and message sink, (74) . In information theory (75) to Shannon, the channel can be characterized by the set of conditional probabilities of occurrence of all the messages received at the message sink when a given message emanates from the message source.

（75）是（）

A.separately

B.respectively

C.individually

D.distributed

物体由静止开始运动，加速度恒定，在第7s初的速度是2.6m/s，则物体的加速度是

A．0.4m/s²

B．0.37m/s²

C．2.6m/s²

D．0.43m/s²

阅读下面材料，回答问题：（10分）

材料一　某年杭州国内游客统计。

材料二　西湖位于杭州城西，三面环山，东面濒临市区。在以西湖为中心的60平方千米的园林风景区内，分布着主要风景名胜40多处，重点文物古迹30多处。1982年西湖被确定为国家风景名胜区，1985年被评为“中国十大风景名胜”之一。下图是以杭州为中心300千米范围示意图。

材料三　“自驾”旅游，是彰显个性，时尚的旅游方式，自由、随意的旅行安排，近几年来在长三角地区日益盛行。

(1) （2分）“自驾游”在我国长三角地区迅速兴起的原因是(　　)

A．经济收入的差别不断增大

B．旅游业中介服务机构日渐衰落

C．交通的发展及休闲时间增多

D．新的旅游景点不断增多

(2)（3分）分析材料可知，杭州旅游业的主要客源地是

________________________________________________________________________。

(3)（3分）西湖是杭州最为著名的旅游区(景点)，该景区具有很大的旅游价值，其主要原因是

________________________________________________________________________

________________________________________________________________________。

(4)（2分）列举出两个分布在以杭州为中心300千米范围内的“世界遗产”：

________________________________________________________________________。

咸菜包括以蔬菜经食盐腌渍或蔬菜经食盐腌渍后，再用( )腌渍而成的产品。

A．酱油或虾油

B．醋

C．糖

D．酒

生产成本