请教GWD 1-7 1-8

GWD1-Q7:

A recent review of pay scales indicates that CEO’s now earn an average of 419 times more pay than blue-collar workers, compared to a ratio of 42 times in 1980.

1. that CEO’s now earn an average of 419 times more pay than blue-collar workers, compared to a ratio of 42 times

2. that, on average, CEO’s now earn 419 times the pay of blue-collar workers, a ratio that compares to 42 times

3. that, on average, CEO’s now earn 419 times the pay of blue-collar workers, as compared to 42 times their pay, the ratio

4. CEO’s who now earn on average 419 times more pay than blue-collar workers, as compared to 42 times their pay, the ratio

5. CEO’s now earning an average of 419 times the pay of blue-collar workers, compared to the ratio of 42 times

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GWD1-Q8:

The 32 species that make up the dolphin family are closely related to whales and in fact include the animal known as the killer whale, which can grow to be 30 feet long and is famous for its aggressive hunting pods.

1. include the animal known as the killer whale, which can grow to be 30 feet long and is

2. include the animal known as the killer whale, growing as big as 30 feet long and

3. include the animal known as the killer whale, growing up to 30 feet long and being

4. include the animal known as the killer whale, which can grow as big as 30 feet long and is

5. include the animal known as the killer whale, which can grow to be 30 feet long and it is

第7题选C,是否存在'42 times their pay', 里面的their指代不清?

第8题为什么选A不选D？

BOW~~

D. include the animal known as the killer whale, which can grow as big as 30 feet long and is
        

如果把红字部分用简单形式来表示就是: it grow 30 feet long big, 显然是错误的,因为 long 和 big重复,

如果原文是which can grow as long as 30 feet and .......就对了(答案A即为此种表达的简单形式)

我也有类似的疑问。

有道理。

第7题为什么是C呢？