在教育实验研究假设的表述上，一定要采用()句。

The Western Council for Travel Research in _______ employed the term visitor.

China is a mountainous country.Hills,mountains,and plateaus cover _______ of the total area.

取样的第一步是明确()。

一般说，样本容量与样本代表性呈()相关。

As to the various pollutions,which of the following is NOT true?

理论构思实质是一种有待检验证明的()。

In the U.K.,the Queen's Silver Jubilee is in _______.

Tourist expenditures have different effects on a destination economy:sales by food vendors to restaurants are _______ effect;while taxi fares and airline ticket sales are _______ effect.

______ are the primary destinations for the Chinese at present.