[填空题]The author changed his minors.

[填空题]The author expressed his regret to his friend and his wife for arriving there too late.

[填空题]Throughout history man has changed his physical environment in order to{{U}} (36) {{/U}}his way of life. With the tools of technology he has{{U}} (37) {{/U}}many physical features of the earth. He has {{U}} (38) {{/U}}woodlands into farmland, and made lakes and reservoirs out of rivers for irrigation{{U}} (39) {{/U}}or hydroelectric power. Man has also modified the face of the earth by draining marshes and cutting’ through mountains to build roads and railways. However, man’s changes to the physical environment have not always had{{U}} (40) {{/U}}results. Today, pollution of the air and water is an{{U}} (41) {{/U}}danger to the health of the planet. Each day thousands of tons of gases come out of the exhausts of motor{{U}} (42) {{/U}}, smoke from factories pollutes the air of the industrialized areas and the{{U}} (43) {{/U}}areas of countryside. The air in cities is becoming increasingly unhealthy. {{U}} (44) {{/U}}In the sea, pollution from oil is increasi

[单项选择]Why hasn’t Sam changed his apartment yet
A. He’s spent all his money.
B. After all he prefers his old one.
C. He hasn’t, found one large enough.
D. He hasn’t found a suitable one.