In which of the following places can you often see this sign?

A. In a park.????????????? ????????????? ????????????? ????????????? ????????????? B. In a school

C. In a science museum.????????????? ????????????? ??? D. In a street

In which of the following places can you often see this sign?

A. In a park.                               B. In a school.                              

C. In a science museum.                     D. In a street.

As you are soon on your way to Eastern Europe, here are a few tips on what you should pack. In general, pack lightly, with only the most basic clothes. People dress casually(随便地) in Eastern Europe, so you don’t need to bring along your smartest clothing.
Batteries: If your camera, flash, or other appliances run on batteries, bring enough supply along. Certain types of batteries don’t exist in Eastern Europe, and those that do often don’t last very long.
Cash: We have found it good to have supply of small-unit U.S. bills($1and $5) to use in hard–currency stores, to buy international train tickets, etc. The hard–currency stores never seem to have the right change.
Electric Current Adapter(转换器): If you bring any appliances, remember that the electricity in Eastern Europe uses 220 volts A.C., not the standard 110 volts of North America. A 110 volts appliance will soon burn out when attached to an unchanged 220-volt plug.
Language Tools: One of Europe’s biggest challenges is communicating with the local people since their languages are so different from our own. To help overcome difficulties, you might buy phrasebooks before you go — you won’t find them once you are in Eastern Europe.
Money Belt: A money belt is especially helpful when you have many documents to carry around ( as you always do in Eastern Europe). The best one we find is made by Eagle Greek Travel Gear, 143 Cedros Ave. (P. O. box 651), Solona Beach, CA 92075 (tel. 619/755 – 9399, or toll free 800/874 – 9925) outside California.
Traveler’s Checks: These are necessary. Bring your traveler’s checks in small to medium unit ($10, $20, or $50) to change a little bit at a time, so as not to be left with a lot of local money. To be on the safe side, be sure to copy down the check numbers in two places, just in case something happens to the checks.
【小题1】How many tips are mentioned in the passage?