39. Angiosperms are the most successful terrestrial plants. This success is due to all of the following except
(A) reduced gametophyte.
(B) fruits enclosing seeds.
(C) xylem with vessels.
(D) animal pollination.
(E) sperm cells with flagella.

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統計： A(3), B(1), C(4), D(1), E(35) #2308369