答案：A分析：空格前为状语，空格处缺主语。(B)、(C)均不能作主语，

答案：A分析：空格前为状语，空格处缺主语。(B)、(C)均不能作主语，(D)不定式作主语时谓语动词一般用单数形式，而句中谓语动词是复数形式are，故正确答案为(A)。参考译文：北美洲上千个品种的鸟类中，那些有鲜红色羽的品种，比如主红雀，通常被指定为州鸟。

Kết quả (Anh) 1:

Answer: a analysis: space before going to space shortage subjects. (B), (c) are not subject, (d) infinitive verb when the subject is singular form, and sentence the verb is plural are, so that the correct answer was (a). Text: in the thousands of species of birds in North America, those bright red feathers like Cardinal, usually designated as the State bird.

Kết quả (Anh) 2:

Answer: A analysis: Before a space is adverbial, lack of space at the subject. (B), (C) are not as subject, (D) as a verb in the infinitive generally use the singular form when the subject, but is the plural form of the verb in the sentence are, so the correct answer is (A). Passage: thousands of species of birds in North America, those bright red feathers of the species, such as the main cardinals, generally designated as the state bird.

Kết quả (Anh) 3:

The answer: A analysis: before the space is an adverbial, the space is a lack of subject. (B), (C) D is not a subject, the predicate verb is usually in the singular form, while the verb is plural form are, so the correct answer is (A). Text: North America thousands of varieties of birds, the bright red plumage varieties, such as Cardinals are often specified for the state bird.