Hydrocarbons, with which fruit flies perfume themselves in species-specific blends, are known to be important in courtship, and apparently this assists flies that taste the hydrocarbons on prospective mates to distinguish their own species from that of others.
D apparently assisting flies to taste the hydrocarbons on prospective mates to distinguish their own species from those of
E apparently assisting flies that taste the hydrocarbons on prospective mates in distinguishing their own species from
选E不选D是因为D用了to，Hydrocarbons是不能去taste一个东西的
但是在这道题里
Nineteenth-century doctors thought that alcohol, when ingested, passed through the stomach into the bloodstream and was broken down only by the liver; recent studies, however, have led them to conclude that the stomach breaks down up to 20 percent of ingested alcohol before it reaches the liver.
C have led doctors to conclude
E lead to the doctors` conclusion