试题题干
The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.
When pigeons can see the sun, they use it as their main means of direction finding. When they cannot see the sun they use some special way to sense direction from the earth's magnetic field.
To have a （） way of sensing direction.
参考答案
正确答案：
试题解析
大意：有一种特定的方向感知方法。particular特定的。