下列针对集体合同的描述，错误的是()。
A.集体合同是一种劳动协议
B.集体合同是特定当事人之间订立的协议
C.劳动行政部门自收到集体合同文本之日起30日内未提出异议的，集体合同即行生效
D.必须是书面合同，其生效要经过特定程序
参考答案：C
解析：本题考查集体合同的相关内容。劳动行政部门自收到集体合同文本之日起15日内未提出异议的，集体合同即行生效参见教材P184、185
The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952, on one small Japanese island, scientists dropped some 26 in the dirt for the monkeys. The monkeys liked their taste, but they found the dirt 27 . One clever 18-month-old monkey found she could 28 the problem by washing the sweet potatoes in a nearby river. She taught this to her mother. Her 29 also learned this new way and they taught their mothers, too. All the younger monkeys 30 learned to wash the dirty sweet potatoes to make them 31 to eat. But many old monkeys found it very hard to learn this and still ate the 32 sweet potatoes. Then something very surprising 33 . In the autumn of 1958, scientists found that the monkeys on other nearby 34 began washing their sweet potatoes too. Scientists still don’t fully understand how this knowledge was 35 from one island to another.
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