4 Complete the paragraph with the correct form of the words below.注意有词尾变化
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5 Complete the sentences with the correct form of the expressions below.
6 Replace the underlined words with the correct form of the words below. You may need to make other changes.
7 Answer the questions about the words and expressions.只填入选项的代号（A or B大小写无所谓）
我国横向最长的一条通道为：
A. 青银通道
B. 沿江通道
C. 京哈-京港澳通道
D. 陆桥通道
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