求助新东方蓝色教材上的语法题几道。

bonnie0715

P142-1
People have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget them every time a new source of cheap energy is developed.
(A) have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget
(B) have discovered the principles of solar energy whenever fuel has become scarce and expensive but they forget
(C) discovered the principles of solar energy every time fuel becomes scarce and expensive, forgetting
(D) discover the principles of solar energy every time fuel became scarce and expensive, but they forget
(E) discover the principles of solar energy whenever fuel becomes scarce and expensive but forget
句子有点晦涩啊。forget是用倒装么？如果倒装的话不是应该把整个宾语提前么？
P141-18
Intended primarily to stimulate family summer travel,
the new airfare, which allows both an adult and a
child to fly for the price of one ticket, and also
shortens the advance-purchase requirement for family
travel to a minimum of seven days rather than
fourteen.

(A) and also shortens the advance-purchase require-
ment for family travel to a minimum of seven
days rather than
(B) and also lessens the advance-purchase
requirement for family travel to a seven-day
minimum from
(C) also shortens the advance-purchase requirement
for family travel to a minimum of seven days
rather than that of
(D) also lessens the advance-purchase requirement
for family travel to a seven-day minimum from
(E) also shortens the advance-purchase requirement
for family travel to a minimum of seven days
rather than

A为什么错呢？不是用and更对称么？还是说and also罗嗦啊？

When drive-ins were at the height of their popularity in the late
1950's, some 4,000 existed in the United States, but today there are
less than one-quarter that many.

A. there are less than one-quarter that many
B. there are fewer than one-quarter as many
C. there are fewer than one-quarter of that amount
D. the number is less than one-quarter the amount
E. it is less than one-quarter of that amount
为什么选择C呢?不是说只有在修饰人的时候才用few么？

谢谢高人指点

cat19bear

P141-18
Intended primarily to stimulate family summer travel, the new airfare, which allows both an adult and a child to fly for the price of one ticket, and also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than fourteen.

(A) and also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than

and also 是重复了  － 参照 XDF 赵丽老师说的

bonnie0715

谢谢你

tracyforever

People have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget them every time a new source of cheap energy is developed.
(A) have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget
(B) have discovered the principles of solar energy whenever fuel has become scarce and expensive but they forget
(C) discovered the principles of solar energy every time fuel becomes scarce and expensive, forgetting
(D) discover the principles of solar energy every time fuel became scarce and expensive, but they forget
(E) discover the principles of solar energy whenever fuel becomes scarce and expensive but forget
句子有点晦涩啊。forget是用倒装么？如果倒装的话不是应该把整个宾语提前么？

是E么？不是倒装，是一般语句，后面那个them是principles of solar energy

P141-18
Intended primarily to stimulate family summer travel, the new airfare, which allows both an adult and a child to fly for the price of one ticket, and also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than fourteen.

(A) and also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than
(B) and also lessens the advance-purchase requirement for family travel to a seven-day minimum from
(C) also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than that of
(D) also lessens the advance-purchase requirement for family travel to a seven-day minimum from
(E) also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than

A为什么错呢？不是用and更对称么？还是说and also罗嗦啊？

是C么？不应该用and also，应为前面那个which引导的是定语，后面的lessen部分才是谓语，这个不可以对称

When drive-ins were at the height of their popularity in the late 1950's, some 4,000 existed in the United States, but today there are less than one-quarter that many.

A. there are less than one-quarter that many
B. there are fewer than one-quarter as many
C. there are fewer than one-quarter of that amount
D. the number is less than one-quarter the amount
E. it is less than one-quarter of that amount
为什么选择C呢?不是说只有在修饰人的时候才用few么？

可数不可数的区别，但是Gmat中似乎对这个区分的不时特别严格，这里看句型就只有C是对的

bonnie0715

顶起来