Though managers of commercial shellfish beds in many countries monitor the presence of pollutants using mice, this method is ethically（）and too expensive for many developing countries, small operations or amateur fishermen.

In spite of（）among a few scientists, and years of（）disc...

单项选择题In spite of（）among a few scientists, and years of（）discussion, the claim that earthquakes can be predicted with great precision prevails.

Even though Jung's theory of the mind has been designat...

单项选择题Even though Jung's theory of the mind has been designated as（）by its recent proponents, one can scarcely argues that it offers a truly gestalt and complete picture of the psyche's operation.

There are few precious constants in the story of the ye...

单项选择题There are few precious constants in the story of the yen-for a start, it is among the monies of the world, being not much more than a century old.（）