题干

小明两次煮鸡蛋,第一次在水烧开后继续用急火煮,直到煮熟;第二次在水烧开后将火焰调小,但仍保持锅中的水沸腾,直到煮熟.两次比较发现(  )

A:第一种方法比第二种方法省燃料又省时间

B:第一种方法费燃料但省时间

C:第二种方法比第一种方法省燃料但费时间

D:第二种方法比第一种方法省燃料,两种方法所用时间相当

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答案(点此获取答案解析)

D

同类题5

阅读下面短文,掌握其大意,然后从每小题所给的A、B、C、D四个选项中,选出一个最佳选项。

    There are many differences between Chinese and Western eating habits. In the West, everyone has their own 1of food. But in China the dishes are  2  on the table and everyone shares. If you are being treated by a Chinese host, there must be3 food prepared for you. Chinese are very  4 of their culture and will do their best to show their hospitality (好客).

    And sometimes the Chinese host uses his/her 5 to put food in your bowl or plate. This is a sign of politeness. The proper thing to do would be to eat the whatever-it-is and say how   6 it is. If you feel uncomfortable with this, you can just say a polite  "Thanks” and leave the food there. Don't 7  your chopsticks upright into the rice bowl. Instead, lay (放置) them on your dish. The reason for this is that when somebody  8, the shrine (神祠) has a bowl of sand or rice with two chopsticks which are stuck upright in it. It is impolite to set the teapot down where the spout (壶嘴) is facing 9 somebody. The spout should always be directed to where nobody is sitting, usually just outward (向外) from the table.

    Don't hit on your bowl with your chopsticks. Beggars (乞丐) hit on their bowls, so this is not polite. Also, when the food is coming too  10 in a restaurant, people will tap their bowls. If you are in someone's home, it is like off ending the cook.