题目内容

The two main problems in Venice are ____________________.

A. too many old residents and too many rich people
B. too many bridges and too much water from high tides
C. high water and too many tourists
D. expensive souvenirs and too many tourists

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The local residents of Venice move out of the city because ______________.

A. there is too much water
B. the houses are few and expensive
C. there are too many residents
D. the city is too crowded

The city is working on the problems in Venice, because ______________________.

A. they want to make more money
B. they want people to enjoy the city
C. they want to help the elderly people
D. they want to help the rich people

Complete these sentences with the words or phrases in the box.alarmbridgesrentromanticbootselderlyresidentsunique1. Many ____ people in Venice own houses that they lived in for many, many years.2. Venice is because it is a city on water. Most other cities are on land.3. In Venice, there are many _ over the canals that people walk across.4. Many people think Venice is ___ because it is old and beautiful. Many people go there to get married.5. Many people cannot live or own a shop in Venice because the _ is too high for them to pay.6. The _____ of Venice know that every year there will be high water. But the young and the old still like to live there.7. When the water in Venice starts to get deep, the sound of a(n) _ tells people there is an emergency.8. People who live in Venice put on their ______ when the water gets high and they want to walk around the city.

能将胃蛋白酶原激活成胃蛋白酶的物质是( )

A. 盐酸
B. 丙谷胺
C. 肠激酶
D. 内因子
E. 前列腺素E2