Americans love dogs, all types of dogs: small dogs, big dogs, lapdogs (供玩赏的小狗). Each year, people spend billions of dollars on their four-legged pals, making sure the lovable dogs have enough food to eat and lots of toys to play with.

Dogs love people, too. They lick their faces, protect their homes. Where did these four-legged companions come from? Some scientists believe that they have found the answer.

Scientists have long known that dogs evolved from（演化） wolves. Exactly when the transformation from wolf to dog actually took place, however, remains a mystery.

Some said dogs evolved as a separate species 135,000 years ago in two parts of the world. One group of dogs developed in Europe and Asia from Asian wolves. The other group evolved in North, Central, and South America from American wolves.

Now researchers say those theories are wrong. New studies suggest that domesticated dogs first appeared 15,000 years ago in eastern Asia. Scientists also say that every modern dog descended from approximately five female Asian wolves, the mother of all modern dogs.

Scientists suspect dogs first set paws in North America by following settlers across a land bridge that once linked northern Asia and North America.

1.According to recent studies, all modern dogs came from female wolves in ______.

2.From this story, we can conclude that _______.

3.The underlined word “domesticated” means “_______”.

4.The best title for this story might be ______.

"My aunt will come down soon, Mr．Nuttel," said a young lady of fifteen．

Framton Nuttel attempted to say something to please the niece． Privately he doubted whether this visit would do much towards helping with his　nerve problem．

"I know how it will be," his sister had said, "People there　 are nice． I shall just give you letters of introduction to all the people I know there．" Framton wondered whether Mrs．Sappleton, the lady to whom he was presenting one of the letters ofintroduction came into the nice division．

"Do you know many of the people round here?" asked the niece．

"Hardly a soul," said Framton．

"Then you know practically nothing about my aunt． Her great tragedy（悲剧） happened

just three years ago," said the child, “Out through that window, her husband and her two young brothers went off for their day's shooting． They never came back． Poor aunt always thinks that they will come back someday． She has often told me about Ronnie, her youngest brother, singing ‘Bertie, why do you bound?"'

At this time, Mrs． Sappleton came in, greeting,“I hope you don't mind the open window．" She talked on cheerfully about the shooting． To Framton it was all purely horrible． He made a desperate but only partially successful effort to tum the talk on to a less scary topic． "The doctors agree in ordering me complete rest, and an absence of mental excitement．" he announced, "On the matter of diet they are not so much in agreement," he continued．

"No?" said Mrs． Sappleton, in a voice which only replaced a yawn at the last moment． "Here they are at last!" she suddenly cried． In the deepening dusk out came three figures with a tired brown spaniel （猎犬）．And then a young voice rang out of the dusk, "I said, Bertie, why do you bound?"

Framton grabbed wildly at his stick and hat, without a word of goodbye, and rushed out of sight．

“What is up?" Mrs． Sappleton was confused．

"I expect it was the spaniel," said the niece calmly, "He told me that he was once hunted into a tomb by a pack of dogs, and had to spend the night in a newly dug tomb with the creatures barking just above him． Enough to make anyone lose their nerve．"

Romance at short notice was her specialty．

72． According to the passage, we leam that Mrs． Sappleton　　　　 ．

　　　 A． felt sorrow about the shooting 　　　　　　　　 B． got along well with Ronnie

　　　 C． listened carefully to Framton 　　　　　　　　　 D． trusted and spoiled her niece

73． As for Framton's nerve problem, his doctors　　　　 ．

　　　 A． recommended him to go off for a shooting

　　　 B． suggested to him a rest cure in the countryside

　　　 C． advised him to keep his mind off excitement

　　　 D． agreed on the treatment of his diet

74． Which word can best describe Framton?

　　　 A． Cheerful． 　　　 B． Brave． 　　　　　 C． Fragile． D． Wise．

75． What can be inferred about the niece from the last sentence?

　　　 A． She was good at making up a story in a short time．

　　　 B． She showed a strong love for scary stories．

　　　 C． She fell in love with Framton in no time．

　　　 D． She took no notice of strange visitors．