Today，pizza is one of the world's favorite foods.All over the world，people make different kinds of pizza.But where does pizza come from？And who made the first one？
   People have been making food like pizza for a very long time.Thousands of years ago，some people mixed flour（面粉）with water to make dough（生面團）.Then they cooked it on hot rocks.Over time，people started using the cooked dough as a plate，covering it with different other foods，like onions，carrots and chicken.They had made the world's first pizza.
   Then，inthe 1500s，some Europeans brought the first tomatoes back from the Americas.Tomatoes are necessary in making many pizzas today.At first，however，most Europeans thought eating tomatoes would make them sick.So，for about 200 years，few people ate them.
   Slowly，people learned that tomatoes were safe to eat，as well as delicious.Later，cooks in Naples，Italy，started the tradition of putting tomatoes on dough.It soon became a favorite food for poor people all over Naples.In 1830，a cook in Naples took another big step in the history of pizza-he opened the world' s first pizza restaurant.
   Today，about five billion pizzas are made every year around the world.In the United States alone，people eat about 350 slices every second!People may not know it，but every piece is a slice of history.

（1）What does the underlined word "it" refer to

B

B

？
A．Flour.
B．Dough.
C．Pizza.
D．Chicken.
（2）When did people bring the first tomatoes to Europe？

B

B

A．Thousands of years ago.
B．In the 1500s.
C．In the 1800s.
D．About 100 years ago.
（3）Why did few Europeans eat tomatoes at first？

C

C

A．Tomatoes at that time were expensive.
B．Tomatoes at that time were not delicious.
C．They thought tomatoes were not safe to eat.
D．They thought eating tomatoes could bring them bad luck.
（4）What's the best title for the passage？

C

C

A．The world's most popular food
B．Pizza in the United States
C．The history of pizza
D．The art of pizza