Two. Threaten Yao's main traffic artery, Ya 'ao, despise Miao railway trunk line, Gansu tunnel, Sui, and howl Hao.

Three. Controversial, accurate, thorough, contemptuous, contemptuous

Four. 1. Zhan Tianyou is an outstanding patriotic engineer in China. Foreigners threaten cliffs, mountains and deep streams. Survey lines should be cut, bridges should be built, steep slopes should be leveled, curvature should be reduced, and careful calculation should be made.

Five. C

C

Six. 1. Encourage careless and insidious people, otherwise. (1) Teachers often encourage us to study with an open mind and keep working hard.

(2) Xiaohong not only achieved excellent results, but also made great progress.

The wind roared and the yellow sand filled the sky.

4. Set an example. 5. Draw the last sentence ① ③