问题
单项选择题
（）动火，必须由要求进行焊割作业的车间或部门的主要负责人填写动火申请表。
A.一级
B.二级
C.三级
D.四级
答案
参考答案：A
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（）动火，必须由要求进行焊割作业的车间或部门的主要负责人填写动火申请表。
A.一级
B.二级
C.三级
D.四级
参考答案：A
It says that bats (蝙蝠) are almost blind (瞎的). Do you know _______ the bat finds the way? In fact (事实上), bats find their ways ______ the help of their ears. Bats make a ______ that we can’t hear at all. They cry when they fly and the echoes (回声) of these cries come back to their ______. In this way they can know where they should go. Bats fly out in the _______. In the daytime, they just stay together in their homes. When the evening comes, they begin to _______ and look for _______. The next morning, they come back from work to sleep _______ the evening. Some people _______ that bats are bad animals. In fact, they are very ______. They catch and eat pests (害虫). This is very good for people.
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