请多多关照－－请教一个关于DS选项的问题，及prep2道题，谢谢各位

shangdigod54

DS题目中，问题是A结论是否成立 （是否的意思是 成立或是不成立）

而由（1）可以退出A结论一定不成立， 那（1）能够推出答案，　需要选吗？　虽然它推出的是　结论不成立。

Ｐｒｅｐ模拟考中的问题

１．On Jane's credit card account, the average daily balance for a 30-day billing cycle is the average of the daily balances at the end of each of the 30 days. At the beginning of a certain 30-day billing cycle, Jane's credit card account had a balance of $600. Jane made a payment of $300 on the account during the billing cycle. If no other amounts were added to or subtracted from the account during the billing cycle, what was the average daily balance on Jane's account for the billing cycle?

(1) Jane's payment was credited on the 21st day of the billing cycle.

(2) The average daily balance through the 25th day of the billing cycle was $540.

2. Malik's recipe for 4 servings of a certain dish requires 1.5 cups of pasta. According to this recipe, what is the number of cups of pasta that malic use the next time he prepares this dish?
(1) The next time he prepares his dish, Malic will make half as many servings as he didi the last time he prepared the dish.

(2) Malik used 6 cups of pasta the last time he prepared this dish.

第一题答案是Ｄ

第二题答案好像是ｃ

谢谢各位。

[此贴子已经被作者于2009/7/17 15:54:13编辑过]