49，The cameras of the Voyager II spacecraft detected six small, previously unseen moons circling Uranus, which doubles to twelve the number of satellites now known as orbiting the distant planet.
(A) which doubles to twelve the number of satellites now known as orbiting
(B) doubling to twelve the number of satellites now known to orbit
(C) which doubles to twelve the number of satellites now known in orbit around
(D) doubling to twelve the number of satellites now known as orbiting（B）
(E) which doubles to twelve the number of satellites now known that orbit
其中B，BE KOWN TO DO D，BE KONWN AS DOING两者用法不解。答案选B，可是ING不是表示“一直。。。”的状态吗，因此我觉得D更好。
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（D）
(E) changes in measurements of the strain across a fault zone, and variations among
among in E wrongly suggests a comparison of different electrical properties rather than of different behaviors of the same properties.
以上AMONG的解释没看懂，与D中的IN 用法有什么区别呢？
73. The British Admiralty and the War Office met in March 1892 to consider a possible Russian attempt to seize Constantinople and how they would have to act militarily to deal with them.
(A) how they would have to act militarily to deal with them
(B) how to deal with them if military action would be necessary
(C) what would be necessary militarily for dealing with such an event
(D) what military action would be necessary in order to deal with such an event（D）
(E) the necessity of what kind of military action in order to take for dealing with it
the if clause in B must take should rather than would.
IF 后面为什么跟SHOULD RATHER THAN WOULD？
为什么D也是WOULD 就好了？
谢谢！
49题, 是习惯搭配的问题, 没有sth known as doing...这种用法
62题,
variations in the electrical properties == "electrical properties发生了变化"
variations among the electrical properties == "各种electrical properties 之间的差异"
73题,你好好去复习一下虚拟语气中"if条件从句"这部分的基础知识,
表示与将来的事实相反,从句必须是should.
D可以是would是因为D不是if条件从句
谢谢解答！
我记得有BE KONWN AS +名词的，那么大概不能说BE KOWN AS+DOING
只能+TO DO /名词
个人认为，应该用 now known to be orbiting.
Sexy...meg...
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