D. Catching the drift of the content instead of understanding every word and never waste too much time on single words.
作听力练习要重材料大意， 而不要力求听懂每个词，不要在单个词上浪费太多时间。
The drift of droplets in spraying diluted 2,4-D butyl ester emulsion by Yun-5 aircraft mounted the GP-81 nozzle has been studied, and a mathematical model has also been set up in this paper.
通过田间试验研究，探索了装配GP—81喷头的运五型飞机喷洒2，4—D丁酯乳油稀释液的雾滴漂移状况，建立了有关数学模型。
Pseudospectral method is used to solve the driven -damped 1-d nonlinear drift -wave equation. Some problems in the computation are discussed.
介绍了用赝谱方法数值求解非线性漂移波方程，讨论了计算中遇到的一些问题。
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