已知函数y=tanωx在（-$\frac{\mathrm{\pi }}{4}$,$\frac{\mathrm{\pi }}{4}$）内是增函数，则（　　）

    Traveling to all corners of the world gets easier and easier. We live in a global village, but this doesn't mean that we all behave in the same way.

    How should you behave when you meet someone for the first time?____In Japan, you should bow, and the more respect you want to show, the deeper you should bow. In Thailand, people greet each other by pressing both hands together at the chest.____

    ____ In Muslim countries, you shouldn't expose your body, especially women, who should wear long blouses and skirts. In Korea, you should take off your shoes when entering a house. Remember to place them neatly together where you come in.

    In Spain, lunch is often the biggest meal of the day, and can last two or three hours.____ In Mexico, lunch is the time to relax, and many people prefer not to discuss business as they eat. In Britain, it's not unusual to have a business meeting over breakfast.

    In most countries, an exchange of business cards is necessary for all introductions. It should include your company name and your position. If you are going to a country where your language is not widely spoken, you can get the back side of your card printed in the local language.____

A. For this reason, many people eat a light breakfast and a late dinner.

B. As the saying goes, "when in Rome, do as the Romans do."

C. In both countries, eye contact is avoided as a sign of respect.

D. In China, you may present your card with the writing side up.

E. An American shakes your hand while looking into your eyes.

F. Many countries have rules about what you should and shouldn't wear.

G. Don't make any noise when you eat or drink soup.

    The Great Wall of China is more than 6,000 kilometres long. It winds ____ (it) way from west to east, across deserts, over mountains, through valleys____at last it reaches the sea. The Great Wall has a history of over twenty centuries. The first part of it ____(build) during the Spring and Autumn period. During the Qin Dynasty, ____(keep) the enemy out of his empire, Emperor Qin Shi Huang had all the walls ____(join) up. Thus, the Great Wall came into being. The Great Wall is wide enough at ____top for five horses or ten men to walk side by side. Along the wall are watchtowers, ____soldiers used to keep watch. Fires were lit on the towers as a ____ (warn) when the enemy came.

    It was ____(extreme)difficult to build such a wall in the ancient days without any modern machines. All the work was done ____hand. Thousands of men died and were buried under the wall they built. The Great Wall was made not only of stone and earth, but of the flesh and blood of millions of men.