There are two types of twins; identical and non-identical twins. Identical twins are formed from a single egg in mother’s body which divides to from two separate babies. Identical twins look the same, and are often dressed by their parents in clothes of the same colors. It is often difficult to tell identical twins from each other, even when they are standing side by side. Non-identical twins come into being when the mother produces two separated eggs a the same time, both of which grow to form babies. In this case the twins look like normal brothers and sisters and are easy to tell one from the other.
　　In the 1970s and 1980s a scientist did some research into twins. He invited many pairs of identical twins to university and asked them to take part in a week of tests. He was particularly interested in adopted (收养) twins who had been separated at birth. He would give the twins different kinds of tests to study their speed of thinking, their speech, their memory, the ways they saw and heard different things, and so on. Time and time again he found separated twins who preferred clothes of the same color, used the same kind of shaving soap, wore the same shaped square glasses and the same colored socks.
　　There is a third type of twins, but it is a very unusual one. Twins which are joined together at birth are known in western countries as Siamese twins.
【小题1】It is difficult to tell identical twins apart because _______.

—What do you think of the book?

—Oh,great.It’s 　　 a second time.

A.worth to read　　　　　　　　　　　　B.worth of reading

C.worthy to be read　　　　　　　　　　D.worthy of reading

________ is reported in the newspaper is that the talks between the two countries are making progress.

Mr. Harris used to work in Dover, but then he changed his work, and he and his wife moved to another town. They did not have many friends there, but they soon met a lot of interesting people, and after a few weeks, they often went to dinner or to parties at other people's houses.
Then Mrs. Harris said to her husband, "We've been to a lot of other people's houses, and now we must invite them to our house, mustn't we?"
"Yes, certainly," answered her husband, "A big party will be the easiest thing, won't it? Then we can start to invite people to dinner in small numbers next month."
So Mrs. Harris said, "Yes, I'll invite all our friends here to a big party on 5th December."
"How many will that be?" Mr. Harris asked. "Don't invite too many."
Mrs. Harris was beginning to write the invitations when her husband saw that she was writing, "Party: 6:30 to 8:30 p.m."
"That isn't very nice, is it?" he said. "You're telling our guests that they must go at 8:30." So Mrs. Harris just wrote "Party: 6:30 p.m."
A lot of guests came, and they all had a good time, so they did not go home at 8:30. In fact they were still there at mid-night when the door bell rang and a policeman arrived. He said, "You must stop making a noise, because someone has complained(抱怨)."
Mr. Harris said he did not want to quarrel with the policeman, so everyone went home. They were sorry to have to go.
When Mr. and Mrs. Harris were alone again, she said to him. "That was a surprise, wasn't it? Who complained about the noise?"
"I did," Mr. Harris answered in a tired voice.
【小题1】Why did Mr. Harris and his wife move to another town?