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The Disappearing Honeybee

Do you run away when you hear a bee buzzing? Many people do. A bee sting hurts and some people are allergic to bee venom(蜂毒). But did you know that bees are very important to humans? Honeybees do more than just make honey. They fly around and pollinate(传授花粉) flowers, plants, and trees. ___11___ One third of America's food supply is pollinated by the honeybee.

Have you seen or heard a honeybee lately? Bees are mysteriously disappearing in many parts of the world. Most people don't know about this problem. It is called Colony Collapse Disorder(CCD). Some North American beekeepers lost 80% of their hives(蜂巢)from 2006-2008.___12___.

The disappearance of the honeybee is a serious problem. Can you imagine never eating another blueberry? What about almonds and cherries? Without honeybees food prices will skyrocket(猛涨).___13___.

This problem affects other foods besides fresh produce. Imagine losing your favorite ice cream! Haagen Daaz is a famous ice cream company. Many of their flavors rely on the hard working honey bee. ___14___ They also created a website called helpthehoneybee.com.

Donating money to research is the most important thing humans can do to save the honeybees. Scientists need money to investigate the causes of Colony Collapse Disorder. Some scientists blame CCD on climate change. Others think pesticides(杀虫剂)are killing the bees.___15___Beekeepers transport their hives from place to place in order to pollinate plants year round.

Not everyone has money to donate regularly. There are other ways to help the honeybee. Spread the word, by telling your friends and family about the problem. Tell your teacher about the disappearing bees too. Maybe your class can write a letter to the government.

A. In 2008 Haagen Daaz began raising money for CCD

B. It is hard to pin down what has been causing honeybees to vanish

C. The poorest people always suffer the worst when there is a lack of food

D. Our fruits, nuts, and vegetables rely on these pollinators.

E. Commercial bee migration may also cause CCD.

F. Bees in Italy and Australia are disappearing too.

People began to rely on the mouse for routine computer tasks ever since Stanford University invented computer mouse.（）

True

False

Not Given

According to the author, general computer users need not know how the computer mouse was invented.（）

True

False

Not Given

The computer mouse derives its name from the cable that goes out its body, which looks like the tail of a mouse.（）

True

False

Not Given

LED technology is widely used in various fields all over the world.（）

True

False

Not Given

The key components of a computer mouse are the two LED.（）

True

False

Not Given

When an ordinary computer mouse get dirty, it has to be replaced with a new one.（）

True

False

Not Given

The most durable computer mice on sale are the IBM ones.（）

True

False

Not Given

The optical mouse is superior to the basic in that the former has no moving parts.（）

True

False

Not Given

材料全屏

Piano

【*】For a century and a half the piano has been one of the most popular solo instruments for Western music. Unlike string and wind instrument, the piano is completely self-sufficient, us it is able to play the melody and its accompanying harmony at the same time. For this reason, it became the favorite household instrument of the nineteenth century.

【*】The ancestry of the piano can be traced to the early keyboard instruments of the fifteenth and sixteenth centuries--the spinet(小型立式钢琴), the dulcimer(洋琴), and the virginal(小键琴) In the seventeenth century the organ(管风琴), the clavichord(古钢琴), and the harpsichord(大键琴) became the chief instruments of the keyboard group, a supremacy they maintained until the supplanted them at the end of the eighteenth century. The clavichord's tone was metallic and powerful; nevertheless, because of the variety of tone possible to it, many composers found the clavichord a sympathetic instrument for intimate chamber music. The harpsichord with its bright, vigorous tone was the favorite instrument for supporting the bass of the small orchestra of the period and for concert use, but the character of the tone could not be varied save by mechanical or structural devices.

【*】The piano was perfected in the early eighteenth century by a harpsichord maker in Italy (though musicologists point out several previous instances of the instrument) This instrument was called a piano e forte ( soft and loud), to indicate its dynamic versatility; its strings were struck by a recoiling hammer with a felt-padded head. The wires were much heavier in the earlier instruments. A series of mechanical improvements continuing well into the nineteenth century, including the introduction of pedals to sustain tone or to soften it, the perfection of a metal frame, and steel wire of the finest quality, finally produced an instrument capable of myriad tonal effects from the most delicate harmonies to an almost orchestral fullness of sound, from a liquid, singing tone to a sharp, percussive brilliance.

【单选】

What does the passage mainly discuss?（）

The historical development of the piano

The quality of tone produced by various keyboard instruments

The uses of keyboard instruments in various types of compositions

The popularity of the piano with composers