The study of natural history is not something to be left to biologists. In fact, their capacity _________ the time they can spend away from their offices is very limited.

A．in terms of

B．in view of

C．in favour of

D．in search of

虽然在尼日尔农村地区人们用手抓着吃饭，但尼日尔的上层人士用餐时习惯使用刀叉等餐具。