有两道OG题，想了半天还是没想明白，虽然有问题解析，还是不明白，汗~~~
1、Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sentinels and to sound a warning at the approach of danger, and scouting outside the cave for new food and roosting sites.
A、acting as sentinels and to sound
B、acting as sentinels and sounding
C、to act as sentinels and sound
D、to act as sentinels and to sound
E、to act as a sentinel sounding
答案B中，这几个分词倒底是怎么并列的？是defending、acting 、 sounding、scouting并列吗，那中间可以有两个AND 吗？
2、12. Formulas for cash flow and the ratio of debt to equity do not apply to new small businesses in the same way as they do to established big businesses, because they are growing and are seldom in equilibrium.
A、Formulas for cash flow and the ratio of debt to equity do not apply to new small businesses in the same way as they do to established big businesses, because they are growing and are seldom in equilibrium.
B、Because they are growing and are seldom in equilibrium, formulas for cash flow and the ratio of debt to equity do not apply to new small businesses in the same way as they do to established big businesses.
C、Because they are growing and are seldom in equilibrium, new small businesses are not subject to the same applicability of formulas for cash flow and the ratio of debt to equity as established big businesses.
D、Because new small businesses are growing and are seldom in equilibrium, formulas for cash flow and the ratio of debt to equity do not apply to them in the same way as to established big businesses.
E、New small businesses are not subject to the applicability of formulas for cash flow and the ratio of debt to equity in the same way as established big businesses, because they are growing and are seldom in equilibrium.
答案D 我觉得也有问题，这里them不也是指代不清吗？
1、是大并列和小并列的问题，也许这样可能你会明白一点：such as defending the entrance, （acting as sentinels and sounding a warning at the approach of danger）, and scouting outside the cave for new food and roosting sites.
括号里面的是小并列。
2、这里有个主、从句的代词指带问题，这里的them只能指带主句的formulas
以上只是个人意见，仅供参考！作者: nicepp 时间: 2003-9-12 11:15 标题: 谢谢2楼的，我还是有点模糊？
1，在 “acting as sentinels and sounding”这个小并列里面，是acting 与
sounding 并列吗？
2、D中them指代formulas ，但根据题意，应该指代new small businesses 。感到迷茫~~[em00]作者: bigmouse 时间: 2003-9-12 13:55
2.应该指代前面句子的主语。主句是主谓宾结构，所以代词是宾语不应该指代主语，否则不合逻辑。
据个例子：Because Mike is not very strong, Peter beats him. 这种情况作为宾语him显然不会指代主语Peter。作者: nicepp 时间: 2003-9-15 15:02 标题: 想通了，谢谢！
谢谢各位NN
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