管道效应

新生儿预防淋病奈瑟菌性眼结膜炎可用

A．龙胆紫

B．碘酒

C．过氧化氢

D．硝酸银

E．蛋白水溶液

△÷（○×□）=△÷○×□______．

It is the season for long lines and frayed(紧张的) nerves. Here are some ways to survive a holiday flight.

Lighten up

Do yourself a favor and ship your presents. Nearly every US airline charges a fee to check a bag, so shipping gifts is now cheaper and more convenient than carrying them in your luggage.

Weigh your options

Not knowing what you’re going to pay for your luggage is annoying. So calculate your overweight-luggage fees at home. You can find the fees out in advance by visiting new site Luggage Limits, which provides the latest information on more than 90 airlines.

Leave amateurs in the dust

Trust us and get to the airport an extra half-hour early. The check-in and security lines are filled with inexperienced files, and it’s a hard walking. Plus, if you decide to cut it close you may not get onto the flight at all. To reduce costs, airlines have reduced on flights and routes. The remaining flights are more likely to be oversold, especially on busy travel days. Fliers who check in early are the least likely to get bumped from oversold flights.

Take it public

The rates for renting a car at the airport have more than doubled over the past year because rental lot inventories have decreased dramatically(现住地). True, renting at the airport is convenient, but it’s just not worth it anymore. Unless you really need a car, take public transportation, hop a cab, or beg a friend to pick you up at the airport instead.

Say no to bumper cars

Tell the people picking you up to avoid parking their car. They can hang out in their car for free while waiting to get a call from you when you land. Many airports, including JFK and LAX now feature this sensible choice.

小题1:How does the author think of shipping gifts?

A．Unnecessary.

B．Expensive.

C．Inconvenient.

D．Wonderful.小题2:Airlines have reduced flights to _________.

A．deal with crisis

B．reduce the time for leave

C．lower the cost

D．provide more job chances小题3: It can be learned from the passage that ______.

A．renting a car at the airport is expensive

B．taxis stay at the airport free of charge

C．cars can park at the airport for free

D．JFK encourages people to take a taxi小题4: What’s the best title for the passage?

A．Five ways to survive a holiday flight.

B．Good seasons for flight.

C．Cars at the airport.

D．How to board a flight

试用表解法概括一下筛选营养缺陷型突变株的主要步骤和方法。

一号线地铁列车交流接触器触点的接触形式有（）和面接触两种。