A．Because industrialization had damaged the beauties of the countryside.
B．Because the woods and fields were too far away to be visited.
C．Because they found it impossible to make a trip within one day.
D．Because their parents did not permit them to go to far away places.

A．Because he was a great inventor.
B．Because he knew a lot about techniques.
C．Because he talked about the product itself simply.
D．Because he emphasized the advantages of using a new product.