47.What is the best title for the whole passage?

A.Man-made clocks   B.Nature’s clocks

C.Time and clock      D.How people keep time

D

Machu Picchu is considered to be a truly extraordinary archaeological(考古学的)discovery and is one of South America’s largest tourist sites. As many as one thousand visitors visit the ancient Ionian(印加文化的)ruins daily. What draws vacationers and adventurers to this remote location high in the Andes Mountains of Peru(秘鲁)?A large part of the attraction is the mysteries that surround Machu Picchu. For example,Machu Picchu is:Considered “the lost city” of the Incas because it was never found by Spanish invaders and was known to only a few local peasants for almost four hundred years.

The “city in the clouds”,Machu Picchu’s lasting beauty comes from the careful blending of its striking architecture with its mountaintop environment. Its greatest skill shows are in the stone structures,which equals t hat of the ancient Egyptians. The stone blocks were so appropriately cut that they fit together without the need for mud. The largest stones at Machu Picchu weigh as much as fifteen tons! It has been difficult to explain how the huge blocks were transported. The buildings, including many that have survived lots of earthquakes,contain stones which interlock so perfectly that fl knife cannot be forced between them. When compared to other ancient civilizations,it is difficult to understand how Machu Picchu could have been missed by the Spanish and lost from history for four hundred years.

For many of the mysteries of Machu Picchu being unsolved,it is clear why Machu Picchu remains “the most famous ruins in all of South America”.

43. What’s the main idea of the passage?

A. Computers are stupid and inefficient

B. Computer errors are basically human errors

C. Computers can help department stores update the price list

D. Supermarket price errors are often made by computers

C

How did Ancient People Tell Time?

Natural ways of keeping time.

In ancient time.people had to use the sun and the moon to tell time.They got up when the sun came up and worked in the fields until the sun went down.

Man-made things

The sand c1ock is made of two glass balls joined by a narrow neck.The top ball was filled with sand.The sand slowly moved through the neck into the bottom ball.People knew how much time had passed when all the sand had fallen to the bottom ball.

People also made the water clock.They made a small hole near山e bottom of a pot.Then they filled the pot with water.Markings inside the pot showed how much time passed as the water dripped(滴)out of the hole.

Nature’s C1ocks in Living Things

Animals’ Body Clock

Animals do not need clocks to know time.They have a way of telling time by their bodies.Birds know when to fly to warmer places before winter.some animals know when to keep more f00d for the cold winter months.Some fish know when it is time to move up the river and lay eggs.

Plants have their own clocks

Plants als0 have their own clocks to keep time.Plants know when to open flowers or when to drop their leaves.

The Body Clock in Human Beings

People also h8ve their own body clocks.When we get used to our lives,our body clocks can be very accurate.It can tell us when it is time to wake up.It can also tell us when to eat or to go to sleep.

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