What basic problem are we told most trade unions face？
A. They are equal in size of influence.
B. They are less powerful than ever before.
C. They don't have enough members.
D. They are not organized efficiently.
资格考试合格的人员，取得《报检员资格证》。1年内未从事报检业务的，《报检员资格证》自动失效。
A. 正确
B. 错误
【B19】
A. free
B. retrieve
C. release
D. expose
国际疫情的公布与撤销是以公布疫区和撤销疫区的形式进行的。
A. 正确
B. 错误
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