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【判断题】
国家标准《旅游资源分类、调查与评价》（GB/T 18972—2003）依据旅游资源的性状，即现存状况、形态、特性、特征等将旅游资源分为8个“主类”、31个“亚类”、155个“基本类型”。A.
正确
B.
错误
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举一反三
【简答题】We should ______ when we receive a suspicious letter.
【单选题】__________ we had read your letter __________ the true state of affairs.
A.
It was until; that we understood
B.
It was not until; we understood
C.
Until; did not we understood
D.
Not until; did we understood
【简答题】From the letter，we can know＿＿＿．
【单选题】______ an answer, he decided to write another letter to them.
A.
Receiving
B.
Not being received
C.
Having not received
D.
Not having received
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