xfd蓝皮问题求助

Quasars are so distant that their light has taken billions of years to reach the earth;consequently,we see them as they were during the formation of the universe.

A  we see them as they were during the formation of the universe.

E  they appear to us as though in

Answer  A

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

A  reduction of interest rates on loans to financial institutions is both an acknowledgement of the past economic trends and an effort to influence their future direction.

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

Answer  A

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.

E  associated with other calves, they require less medication and gain weight more quickly than

请问than后面不用加do吗？

第二题，reduction是单数，应该是both acknowledges ... and attempts...

最后一题，A的助动词补出补错了，应该补will，而不是do。比较结构助动词补出与否是有效性错误，而补出的正确与否是正确性错误。

第一题不确定，但是我觉得as though意思是实际不是这样，这是看上去是这样，而且appear to us也不合习惯

谢谢！as through 是好像的意思，因为我觉得实际上Quasars 的确不是处于

 the formation of the universe.这个时期，那么appear的用法应该是怎样的呢

 the formation of the universe.这个时期，那么appear的用法应该是怎样的呢

不好意思，appear的用法我还没有总结过，所以我说不确定。但这句话的意思是：“quasars离我们很远，以至于它们发出的光，也要数十亿年才能到达地球。所以，我们今天看到的，是它们在宇宙形成之时的形象。”所以as though不对了。