4.　　　　 A varieties of GM water melon will be seedless.

3.　　　　 The temperature is controlled with computers no matter what the weather is outside.

2.　　　　 It is on this arable land where the farmers produce food for the whole population of China.

1.　　　　 Although it started raining,they kept on work in the fields.

75. New techniques should increase agricultural production ______ be friendly to the environment.

　　　 A. as well as　　 B. not only　　 C. as well　　　　 D. also

74. The students are not allowed ________ in the exam.

　　　 A. to be cheated　 B. to cheat　　 C. cheating　　　　 D. being cheated

73. Every possible use _______ of the arable land to produce more food.

　　　 A. has been made　 B. have made　 C. had been done　 D. had made

72. Before sowing or planting crops, rough ground _____　 and weeds ______.

　　　 A. must be cleaned, remove　　　 B. must clean, remove

　　　 C. must be cleared, removed 　　　D. must clean, removed

71. She also wrote short stories, but she was _______ comedies.

　　　 A. less known as　 B. better known for　 C. more known as　 D. more known for

70. If the _________ of the soil is not good, you ________.

　　　 A. condition, should improve　　 B. state, can better it

　　　 C. conditions, increase it　　　 D. condition, should improve it