未知题型 Revised or rewrote the research paper to improve its overall structure or its parts, such as the introduction, middle paragraphs, and/or conclusion and and also to correct the grammatical errors and mistakes in citation and documentation. The revised essay has a transitional paragraph that clearly presents the main idea(s) of the research paper. (25%) The introduction provides the contextual information for the reader not quite familiar with the issue examined includes a trasitional paragraph. It has an interesting start. (15%) The middle section of the paper explains and analyzes the issue well, presents main ideas clearly, and supports them with sufficient explanations and/or evidence. The materials are well organized. (30%) The conclusion efficiently summarizes the ideas and gives impression closing remarks. (10% The essay is clear from plagiarism, and it strictly follows the APA format in in-text citations and the References page. (20%)

未知题型 What"s Standard English?

单项选择题 合金钢中的合金元素，主要能够提高钢的耐腐蚀性的是：（ ）。