选修7 Unit 5　Travelling abroad.docVIP

Unit 5　Travelling abroadDirections：Read the following passage.Complete the diagram by using the information for the passage.Write NO MORE THAN 3 WORDS for each answer. 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 form two separate babies.Identical twins look the same，and are often dressed by the 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 came into being when the mother produces two separated eggs at the same time，both of which grow to form babies.In the case the twins look like normal brothers or 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 twins who had been separated，at birth.He would give the twins different kind 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 who are joined together at birth are known in western countries as Siamese(连体)twins. Twins 1.________ of twins Definition Character Test results Identical twins Formed from 3.________ in mother’s body which divides to form 4.________. 6.________，often dressed in the same colors. 7．________ to tell from each other when standing side by side. Like clothes of the 10．______，use the same kind of shaving soap，wear the same shaped square glasses and the same colored socks. Nonidentical twins Formed from 5.________ at the same time，both of which grow to form babies. Having