请问Besides到底要不要对称不对称呢？

hua很疑惑的说: 从 og141,og241上两题看来，应该要对称，可是gwd7-33中的正确答案却没有对称阿？

gwd7-Q33:

The health benefits of tea have been the subject of much research; in addition to its possibilities for preventing and inhibiting some forms of cancer, the brewed leaves of Camellia sinensis may also play a role in reducing the risk of heart disease and stroke.

in addition to its possibilities for preventing and inhibiting

in addition to its possibilities to prevent or inhibit

besides the possibility that it prevents and inhibits

besides the possible preventing and inhibiting of

besides possibly preventing or inhibiting (E)

og141. Unlike transplants between identical twins, whose genetic endowment is the same, all patients receiving hearts or other organs must take antirejection drugs for the rest of their lives.

(A) Unlike transplants between identical twins, whose genetic endowment is the same

(B) Besides transplants involving identical twins with the same genetic endowment

(C) Unless the transplant involves identical twins who have the same genetic endowment（C）

(D) Aside from a transplant between identical twins with the same genetic endowment

(E) Other than transplants between identical twins, whose genetic endowment is the same

In E, the construction Other than transplants..., all patients ... must take... drugs illogically suggests, as in B, that some patients are transplants.

og241. As well as heat and light, the Sun is the source of a continuous stream of atomic particles known as the solar wind.

(A) As well as heat and light, the Sun is the source of a continuous stream

(B) Besides heat and light, also the Sun is the source of a continuous stream

(C) Besides heat and light, the Sun is also the source of a continuous streaming

(D) The Sun is the source not only of heat and light, but also of a continuous stream(D)

(E) The Sun is the source of not only heat and light but, as well, of a continuous streaming

As well as heat and light and Besides heat and light cannot logically modify the Sun, the nearest noun, as grammar requires them to do. This misdirected modification suggests that heat and light are also (in addition to the Sun) a source of the solar wind.