单项选择题
1、根据以下资料，回答题。 　　It used to take Redwood City, California police hours to locate gunfire．Now, they have a new tool that helps them find the gunfire quickly．This new tool is called the Shot Spotter, The police began using the Shot Spotter in 1995．They wanted to cut down on gunfire in their city.
　　One Shot Spotter covers a square mile．Eight microphones are put on the roofs of buildings．These microphones pick up gunfire noise．It only takes seven seconds to report the gunfire to the police．Then a red dot on the police map shows where the action is.
　　The Shot Spotter really works well．It locates the gunfire within 20 to 40 feet plus or minus．Redwood City police are very happy with the Shot Spotter．They think it might have helped catch the D.C．sniper.
　　Shot Spotters cost a lot of money．One of them sells for $200,000．Despite the cost, Shot Spotters can be a big help in fighting crime.
Eight microphones placed on rooftops __.
A． talk to police
B． warn the public
C． listen for gunfire
D． play rap music

2、根据下列材料，请回答题：
It was sunrise on an August morning when the captain and his crew cast their nets some 50 miles south of Louisiana in the Gulf of Mexico. As the net was pulled over, the contents were poured out followed by excited cries of "Coins! Coins!
" The fishermen quickly realized they had realized a fishermen's dream: sunken treasure! And not just any treasure, but early American silver dollars that had gone down 210 years earlier.
In 1784, at the end of the American Revolutionary War, a heavily armed ship was bund for the port of New Orleans. On board was a fortune in Spanish Silver Dollars. Hundreds of thousands of them were loaded for the trip to New Orleans, yet not a single one arrived. With no survivors from the ill-fated voyage, historians can only guess at what happened. Some say powerful storms took her down while others speculate it was treasure-hungry pirates (海盗) . Whatever happened, the secret -- along with a treasure valued near $100,000,000 in today's dollars -- was sent to a watery grave some 300 feet below the ocean's surface.
Spanish Silver Dollars were the favorite coins of colonial Americans. Widely used and accepted as payment in the thirteen colonies, the United States government gave them the status of official legal tender. Unfortunately, even though they were struck in large quantities, not many of them survive today. After the Civil War, the government withdrew them from circulation and they were melted down.
Due to the historic discovery of the treasure, GovMint.com is releasing these coins to the public for an amazingly low price. For a limited time, these authentic silver dollars are priced at$49 plus shipping and handling -- a dramatic reduction from the market price of this coin anywhere else worldwide.
What surprised the fishermen on an August morning?        
A. Their net contained a big strange-looking fish.
B. They found the treasure sunken 210 years ago.
C. They found some pieces of a sunken ship in the net.
D. Their net suddenly got caught by something deep in the water.

填空题
3、


4、 坡向主要影响光照强度和        ，使不同坡向的水热状况有较大差异。


5、微分方程y′-3y =O的通解为______.

6、 欲渡黄河冰塞川，_______________。


7、 审美效应一般有三个阶段：_____、_____、_____。


简答题
8、



9、 简述种群分布的类型。


10、 简述风对动物的影响。

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