答案：A测试点：词性。分析：basis是名词，而此处修饰concept

答案：A测试点：词性。分析：basis是名词，而此处修饰concepts应当用形容词basic。解题要点：base，basic，basis均是TOEFL常考的词。

Kết quả (Anh) 1:

Answer: a test point: the speech. Analysis: the basis is a noun, modifying adjectives basic concepts should be used here. Problem solving: Word base,basic,basis is the TOEFL test.

Kết quả (Anh) 2:

Answer: A test point: speech. Analysis: basis is a noun, and adjective here should be used to modify concepts basic. Problem-solving elements: base, basic, basis are often TOEFL test word.

Kết quả (Anh) 3:

Answer: A test point: part of speech. Analysis: basis is a noun, and here the modified concepts should be used to describe the word basic. Problem solving points: base, basic, basis are TOEFL often test the word.