C D

　　76.We are at a critical point in our nation’s history and we cannot go back as

　　A

　　individuals or as a country to what we were ten ,five or even one year earlier.

　　B C D

　　77.He pointed out that a considerable gap existing between the number of hours

　　A B

　　people are paid for working and the number of hours spent in productive labor .

　　C D

　　78.I would have come to see you had it been possible, but I had been so busy then

　　A B C D

　　79.All of the plants now raised on farms have been developed from plants once grew wild.

　　A B C D

　　80.The population of this small town has more than doubled in the past few decades.

　　A B C D