[参考答案]短文题型基础练习 Test 20
61. are warning
62. to collect
63. untreated
64. as
65. What
66. happening
67. other
68. result
69. that
70. an
61. are warning
62. to collect
63. untreated
64. as
65. What
66. happening
67. other
68. result
69. that
70. an
