钛及钛合金管应采用的焊接方法有()。

．Why do Americans like to go to fast food restaurants？

A．It is because fast food restaurants are fast，informal，and inexpensive．

B．It is because people can easily find fast food restaurants．

C．It is because people like to eat hamburgers．

D．It is because fast food restaurants sell nearly every kind of food．

A．They can be got at some of the fast food restaurants.

B．They can be got at most of the fast food restaurants.

C．They can be got at a part of the fast food restaurants.

D．They can be got at all of the fast food restaurants.

A．It is because fast food restaurants are fast, informal, and inexpensive.

B．It is because people can easily find fast food restaurants.

C．It is because people like to eat hamburgers.

D．It is because fast food restaurants sell nearly every kind of food.

The food in a fast food restaurant is (expensive) ______ than that in a hotel.

The writer suggests that______.

A．we should eat more fast food

B．we should not eat too much fast food

C．we should avoid any fast food

D．we should not serve fast food

Many people blame the fast food industry for its unhealthy food offered.()

What is the passage mainly about？

A．American fast food restaurants and their advantages.

B．American fast food restaurants and their disadvantages.

C．American fast food restaurants, their advantages and disadvantages.

D．Increasing needs of Americans for fast food.

Part B

Write an essay about 120 words according to the demands as following. The title is Fast Food, and the first sentence of each paragraph is given.

Fast Food

Fast food is very popular nowadays.

People like to buy fast food because it saves them time.

But fast food has less nutritive value than homemade dishes.