曼彻斯特的桦尺蠖是“适者生存”的一种动物。(      )

设a＞0，b＞0．若 $\sqrt{3}$ 是3^a与3^b的等比中项，则 $\frac{1}{a}+\frac{1}{b}$ 的最小值为（  ）

网上的朋友也许给你的是假象虚拟的友谊，不能取代现实中的朋友。（   ）

    We call the Chinese New Year the Spring Festival. There is a name for each Chinese year. We may call it the year of the Dog, the year of the Monkey or the year of the Pig, etc. And this year is the year of the Snake.

    Before New Year's Day, people are busy shopping and cleaning their houses. On New Year's Eve, there is a big family dinner. After dinner all the family stay up late to welcome the New Year. On the first day of the New Year, people put on their new clothes and go to visit their friends and relatives. They say “Good luck” and some other greetings (问候) to each other. People usually have a very good time during the festival.

B: Less than three times a month.