题目内容

The flying of the Boeing 707 in 1958 marked a new stage for ______ .

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Questions 5-8
Complete the following sentences using NO MORE THAN TWO WORD$ from the text.
The article refers to medieval herbalists as ______ because they didn't always use herbs properly.

Controlling air pollution is another crucial objective; ______devices can reduce the harmful gases emitted from the engine.

事件五：C公司在配套工程设备安装过程中发现附属工程设备材料库中部分配件丢失，要求业主重新采购供货。．问：C公司的要求是否合理？为什么？