求助！！！几道SC问题！！！请牛牛们帮忙看看！！！

1.       As the former chair of the planning board for 18 consecutive years and a board member for 28 years, Joan Philkill attended more than 400 meetings and reviewed more than 700 rezoning applications. ( Prep 破解159)

A.     As the former

B.      The former

C.      Former

D.     She was

E.      As the                                               (Key: E)

这道题觉得Prep上说的不够清楚，所以希望哪位牛牛能够指点一下！

最好5个选项都能解释一下！

2.       At one time, the majestic American chestnut was so prevalent that it was said a squirrel could jump from tree to tree without once touching the ground between New York state and Georgia. （( Prep 破解135)

A.     so prevalent that it was said a squirrel could

B.      so prevalent that a squirrel was said that it could

C.      so prevalent for a squirrel to be said to be able to

D.     prevalent enough that it was said a squirrel could

E.      prevalent enough for a squirrel to be said to be able to             (Key: A)

上面这道的问题主要是觉得A的结构也不完整，少了that; 所以想问一下it was said that 中的that 能省吗？

下面几道都是GWD的：

3．Past assessments of the Brazilian rain forest have used satellite images to tally deforested areas, where farmers and ranchers have clear-cut and burned all the trees, but such work has not addressed either logging, which is the removal of only selected trees, as well as surface fires, burning down individual trees but do not denude the forest.

1. which is the removal of only selected trees, as well as surface fires, burning

2. which removes only selected trees, or surface fires that burn

3. which removes only selected trees, along with surface fires that burn

4. removing only selected trees, or surface fires, burning

E．removing only selected trees, as well as surface fires that burn          (Key: B) 

这道是想问问D为什么不能选？

4．The ancient Anasazi harvested such native desert vegetation as the purple-flowered bee plant, what they now commonly call wild spinach in northern Arizona and other parts of the southwestern United States.

1. what they now commonly call

2. a plant that they now commonly call

3. now commonly called

4. and is mow commonly called

5. which it is now commonly called                               （Key：C）

想问一下这里不选B是不是因为它太wordy了，
        但从语法结构式上来说B是不错的？

5．To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

1. have to know a great deal more than now about the social and economic

2. have to know a great deal more than they do now about the social and economical

3. would have to know a great deal more than they do now about the social and economical

4. would have to know a great deal more than they do now about the social and economic

5. would have to know a great deal more than now about the social and economical         

（Key：E）

至于这道问得有些不好意思了，嘿嘿！！！想问下牛牛们，这里为什么要用would have to结构呀？还有economical和economic在意思上是不同的，而这里明显是social and economic的搭配吗？？？

OG  P708/103

6. The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost.

                                                         （Key: D）

A.     The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost.

B.      The development of a new jumbo rocket is expected to carry the United States into its next phase of space exploration and able to deliver a heavier load of instruments into orbit at a lower cost than the space shuttle.

C.      The new development of a new jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit at a lower cost than the space shuttle.

D.     A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and at a lower cost.

E.      A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle and to cost less.

这道题主要是想问D里面的and at a lower cost做什么成分的，还有它是于谁并列的？E为什么不对，to cost less与to deliver a heavier load of instruments并列不对吗？？？