SAT填空题解答Because insect communities serve as a sort of barometer,----- conditions in their ------,an entomologist's analysis of the insect species in a handful of soil can revel much about the ecosystem.A perserving habitat B stabilizing ran

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SAT填空题解答Because insect communities serve as a sort of barometer,----- conditions in their ------,an entomologist's analysis of the insect species in a handful of soil can revel much about the ecosystem.A perserving habitat B stabilizing ran

SAT填空题解答Because insect communities serve as a sort of barometer,----- conditions in their ------,an entomologist's analysis of the insect species in a handful of soil can revel much about the ecosystem.A perserving habitat B stabilizing ran
SAT填空题解答
Because insect communities serve as a sort of barometer,----- conditions in their ------,an entomologist's analysis of the insect species in a handful of soil can revel much about the ecosystem.
A perserving habitat B stabilizing range C oaserving population D perdicting destination E registering environment
为什么选E

SAT填空题解答Because insect communities serve as a sort of barometer,----- conditions in their ------,an entomologist's analysis of the insect species in a handful of soil can revel much about the ecosystem.A perserving habitat B stabilizing ran
I guess C (if you meant "observing") is a tempting choice to go with, but the idea is that entomologists use insects as a barometer of the ecosystem. So what concerns entomologists is what insect communities reveal about the environment, rather than about the insect population itself. Hence, what an entymologist needs to keep track of is insects' interactions with their environment, i.e. their conditions in the environment. Also, "register" here means "to make a record of something."