______年,西周都城发生平民暴动,这就是______,西周从此走向衰落。
公元前841;国人暴动
(10株洲)18.在①N2O5②x③N2O3④N2⑤NH3五种物质中,它们是按照氮元素的化合价由高到低顺序排列的,则X可能是下列物质中的
A.NO2
B.NaNO2
C. NH4Cl
D.N2O
The book The Natural Approach: Language Acquisition in the Classroom was produced by ______ in 1983.
A. Krashen and Halliday B. Hymes and WilkinsC. Krashen and Terrell D. Halliday and Hymes