下列酶中，哪一个不是基因工程常用的酶

    The holiday season isn't about shopping and gifts.____ However, holiday travel can be more expensive than gifts. Fortunately, the following tips will help keep your travel spending under control.

    Plan ahead. The earlier you book your travel, from airfare to hotels, the easier it is to find good deals.____ Your best prices on airfare come when you book three weeks before the plane leaves for domestic(国内的) flights. For international flights, consider booking 30 days in advance. Many experts point out that you should book travel between one month and three months out for high-traffic holidays.

    Book your air travel on cheaper days. Traveling by air on Tuesdays and Wednesdays often costs less than on Fridays and Sundays. During the holidays, it's not just about a specific day of the week. You also need to consider the days surrounding the holiday but days immediately before and after a holiday can be expensive. One of the best ways to save is to plan your air travel on the day of the holiday.____

    Consider traveling overnight. Red-eye flights and overnight flights often cost less than those at more convenient times.____  Traveling overnight can help you avoid a night in the hotel, as well as save your money on travel to your destination.

    ____ You can't bring liquids with you on the airline, but you can bring sandwiches and other snacks. When you're on the road, you can buy food at local groceries to make your own meals, especially if you have access to（可使用） a microwave.

A. Bring your own food.

B. Consider affordable accommodations.

C. Traveling by plane is not the best choice.

D. Plus, booking earlier can save your money.

E. For instance, traveling on Christmas Day might be a great deal.

F. A great deal of travel also takes place during this time of year.

G. Other choices include sleeper trains as well as overnight ferries.

阅读下面这首宋词，完成下面小题。

踏莎行·山居

张抡

秋入云山，物情潇洒，百般景物堪图画。丹枫万叶碧云边，黄花千点幽岩下。

已喜佳辰，更怜清夜，一轮明月林梢挂。松醪常与野人期，忘形共说清闲话。

松醪：是松膏酿制的酒。