OG66和62的疑惑

66. The Federal Reserve Board's reduction of interest rates on loans to financial institutions is both an acknowledgment of past economic trends and an effort to influence their future direction.

(A) reduction of interest rates on loans to financial institutions is both an acknowledgment of past economic trends and an effort

(B) reduction of interest rates on loans to financial institutions is an acknowledgment both of past economic trends as well as an effort

(C) reduction of interest rates on loans to financial institutions both acknowledge past economic trends and attempt

(D) reducing interest rates on loans to financial institutions is an acknowledgment both of past economic trends and an effort

(E) reducing interest rates on loans to financial institutions both acknowledge past economic trends as well as attempt

it is imprecise to characterize a reduction as performing actions such as acknowledging or attempting 不知道这句话要怎么理解,为什么这么说,请赐教.

62. Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changing the measured strain across a fault zone, and varying the electrical properties of underground rocks.

(A) changing the measured strain across a fault zone and varying

(B) changing measurements of the strain across a fault zone, and varying

(C) changing the strain as measured across a fault zone, and variations of

(D) changes in the measured strain across a fault zone, and variations in

(E) changes in measurements of the strain across a fault zone, and variations among

Moreover, these verbs are used incorrectly because the sentence mentions no subject that is performing these actions. 这句话怎么理解.

我想这两题可能是一类题,主谓之间的逻辑搭配问题,可是不知道有什么原则.