LSAT-11-4-20(CHELSEAYANG更正标题格式)

swimmingfrog

20(B,D).           Some flowering plant species, entirely dependent on bees for pollination, lure their pollinators with abundant nectar and pollen, which are the only source of food for bees. Often the pollinating species is so highly adapted that it can feed from—and thus pollinate—only a single species of plant. Similarly, some plant species have evolved flowers that only a single species of bee can pollinate—an arrangement that places the plant species at great risk of extinction. If careless applications of pesticides destroy the pollinating bee species, the plant species itself can no longer reproduce.

The information above, if true, most strongly supports which one of the following?

(A) The earliest species of flowering plants appeared on Earth contemporaneously with the earliest bee species.

(B) If the sole pollinator of a certain plant species is in no danger of extinction, the plant species it pollinates is also unlikely to become extinct.

(C) Some bees are able to gather pollen and nectar from any species of plant.

(D) The blossoms of most species of flowering plants attract some species of bees and do not attract others.（E）

(E) The total destruction of the habitat of some plant species could cause some bee species to become extinct.

My understanding:

No species----àno plant

E: no plant----àno species

B: plant ----àspecies

D: species only contract certain bees.

我觉得B.D E 都有道理

chelseayang

B wrong: it is mistaken reversal of "species die------plants not able to reproduce"(A---B)
(B: not A------not B)
I don't know how you get this "B: plant ----àspecies"

D wrong:  "most" is baseless

swimmingfrog

got it. 原文是个充分必要条件。bee species-----plant species   A<---->B

so choose E