| 时态问题：if x happens, y happens 还是 y will happen?
In OG 75, ETS explains the rule of "if x happens, y will happen". but why in OG 46, the tense is "if x happens, y happens"? is there any reason that in these two situations, the tense should be different? please see the two questions below:
46. A study commissioned by the Department of Agriculture showed that if calves exercise and associated with other calves, they will require less medication and gain weight quicker than do those raised in confinement.
(A) associated with other calves, they will require less medication and gain weight quicker than do
(B) associated with other calves, they require less medication and gain weight quicker than
(C) associate with other calves, they required less medication and will gain weight quicker than do
(D) associate with other calves, they have required less medication and will gain weight more quickly than do（E）
(E) associate with other calves, they require less medication and gain weight more quickly than
75. If the proposed expenditures for gathering information abroad are reduced even further, international news reports have been and will continue to diminish in number and quality.
(A) have been and will continue to diminish
(B) have and will continue to diminish
(C) will continue to diminish, as they already did,
(D) will continue to diminish, as they have already,（E）
(E) will continue to diminish
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