67．  Ms．Chambers is among the forecasters who predict that the rate of addition to arable lands will drop while those of loss rise．

(A)  those of loss rise

(B)  it rises for loss

(C)  those of losses rise

(D)  the rate of loss rises

(E)  there are rises for the rate of loss

Logical predication + Parallelism

The forecaster is making predictions about two different rates．The forecast changes in the rates can be compared using the construction the rate of x will drop while the rate of y riser, x and y should be parallel．

A  There is no referent for those．

B  It refers to the rate of addition，creating a nonsensical statement．

C  There is no referent for those；of losses should be singular to parallel of addition．

D  Comet. This sentence uses a construction that clearly states the predicted changes in the rates；the rates are expressed in parallel ways．

E There are rises for is wordy and unidiomatic．

The correct answer is D．

不好意思了，题干的意思没有看懂.能帮我解释翻译一下吗?

请教一下NN：

为什么前面是will drop，后面却是rises?

时态前后怎么不一样啊？

谢谢