Test analysis: a) Try your best: Try your best to think and plan. Use it correctly. B unheard of: I've heard something I've never heard before. Describe new and rare things. C take precautions: repair the doors and windows of the house before it rains. Save for a rainy day, bind and extend the repair. Metaphor is to prepare in advance, nip in the bud. Taken out of context, the context only refers to preparation, and does not emphasize taking preventive measures before accidents or disasters occur. D one-hole view: what you see from a small hole is a one-sided view of a narrow gap, which is often used as a modest word.
Comments: Throughout the college entrance examination questions of idioms, it involves several aspects: the emotional color of idioms, the applicable objects, habitual misuse and the use of some bilingual idioms. Of course, in the process of grasping, we should consider the restrictive role of context, including the color and meaning of context, and avoid preconceptions. Pay attention to the following aspects: 1, and pay attention to the emotional color of idioms. We should accumulate some common idioms and grasp their emotional color. 2. Pay attention to the scope of application of idioms. 3. Note that idioms and contextual meanings cannot be repeated.