试题题干
WORD FORMATION
Complete the following sentence with the proper form of the word in the bracket.
(practice) Ideally, an animal should be studied in its natural habitat, but often this is not
possible.
参考答案
试题解析
possible是形容词，需要副词来修饰。所以，变practical为practically。
句意：理想情况下，应该在动物自然栖息地进行研究，但这通常是不可能的。