Can Dogs See Colors?Man's best friend is colorblind(色盲). Fortunately (fortunate), his 41 (survive) does not depend upon the ability to see colors. The 42 (sharp) of his sense of smell makes up for his 43 (fail) to see colors. It helps him to tell between things.44 (study) support the conclusion that dogs live in a 45 (color) world The testing done primarily 46 (focus) on the dogs' responses to colors for food Dogs could not tell the 47 (differ) between one color signal for food, and other colors that were not for food.Most animals' lack of ability to see colors can be 48 (easy) understood Many colorblind animals hunt for food in the dark of night. Their other senses have highly 49 (develop). Thus their lack of color vision does not affect them.Other animals with color vision are 50 (monkey) and apes (猿). Both can be trained to open a colored door, behind which is food.

最近你经历了一次很有意义的旅行,请给你的美国朋友Tom写一封电子邮件,分享你的这次出游,内容包括以下三点:

l 出游地点、时间和交通方式

l 选择这一目的地的理由

l 旅行的感想或收获

请以Li Ke署名。

A Lucky CoinA 1943 US penny made at the Denver Mint(铸币厂) has sold for $1.7 million. That single coin is thought to be the 31__ copper(铜)coin made in Denver that year.Pennies were made of steel in 1943 because copper was in 32__ supply for use in equipment to help 33__World War II. That was the only year that Lincoln pennies were not 34__ of copper.A 35__ coin collector was eager to pay the huge sum for the coin because it was one of a kind And that collector 36__ had a 1943 copper penny from each of the other two US Mints.You might be surprised to 37__ what some of your own coins are 38__ . The more scarce any collectible (可收藏的) item is, the higher the 39__ tends to be. It is possible that you might have a small 40__ sitting in your pocket right now!

A.wealthy        

B.short

C.learn             

D.consisted

E. only              

F. already

G. price      

H. made

I. large              

J. fight

K. fortune         

L. worth

Can Dogs See Colors?Man's best friend is colorblind(色盲). Fortunately (fortunate), his 41 (survive) does not depend upon the ability to see colors. The 42 (sharp) of his sense of smell makes up for his 43 (fail) to see colors. It helps him to tell between things.44 (study) support the conclusion that dogs live in a 45 (color) world The testing done primarily 46 (focus) on the dogs' responses to colors for food Dogs could not tell the 47 (differ) between one color signal for food, and other colors that were not for food.Most animals' lack of ability to see colors can be 48 (easy) understood Many colorblind animals hunt for food in the dark of night. Their other senses have highly 49 (develop). Thus their lack of color vision does not affect them.Other animals with color vision are 50 (monkey) and apes (猿). Both can be trained to open a colored door, behind which is food.

_________

______________

_______

_____

Many Ways of LifeAll over the world, people do many of the same things necessary in order to live, yet in different ways.Along the Amazon River, people live in river houses. Many South American Indians live in grass huts, and Eskimos may live in snow houses. You may be living in an apartment building several stories high. 26__People live in different places, and they eat different foods. 27__ For instance, sea spiders(蜘蛛)are caught for food in Japan. You may have eaten a sea spider, too, in the form of a seafood cold dish. In the United States, you may buy your lunch from a hotdog stad 28__ But there, a native seller may sell you a hotdog that is actually a piece of dog meat.29__ Yet the Indians there have found a way to take the poison out from the plant and use the plant to make flour. From the flour, they make the bread, which is the major food all over South America.Much of the food you eat probably comes from your local supermarket. 30__ But an Indonesian on the island of Bali may wait much longer for a meal. There, a sticky (粘性的) liquid is spread on the end of a long pole. Then it is held up in the air until dragonflies (蜻蜓) come along and are stuck in the sticky liqud In this way, a meal is done.

A.And much of that may need only to be heated before it is ready to eat.

B.Yet sometimes, they may eat the same foods.

C.In South America, there is a very poisonous plant.

D.You may have eaten some of the food yourself.

E. There are hotdog stands on the islands of Sumatra as well.

F. Or you may live in a house.

Failures in research .

Not many people realize that it is difficult to .