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     A fort is a strong building with a high wall around it. It is a safe place________1.________
people can protect themselves. Long ago, there were many forts. Guards
________(站) in towers at the corners of the 2.________
wall. A________the outsides of the wall was a3.________
manmade river. A bridge was let down________it 4.________
when people wanted to enter or l________the fort.5.________
Can you guess who is building fort these days? Today the
 greatest n________of forts are built by children.6.________
These forts are not built to keep enemies________.7.________
It is a special and private place. A person can be
________(独自) in the fort. Only invited guests are 8.________
allowed in. Every kid who wants a special place can
________some kind of fort. A big cardboard box 9.________
makes a nice fort for one________two persons.10.________
答案

1. where    2. stood   3. Around     4.over   5. leave 

6. numbers 7. out  8. alone    9. make   10. or

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构成传染病在人群中流行的三个条件（）。

A.生活条件、经济条件、文化素养

B.年龄、性别、职业

C.传染源、传播途径、人群易感性

D.病情轻重、接触者的多少、疫源地是否经过消毒

E.以上均是
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单项选择题

（）是构成河流的两个要素。

A.河床与河堤

B.支流与干流

C.水流与泥沙

D.水流与河槽
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