答案：A分析：空格前主谓俱全，空格后是完整句子，按题意是做宾语从句，发

答案：A分析：空格前主谓俱全，空格后是完整句子，按题意是做宾语从句，发现什么现象。A正确，the planet做Mercury的同位语。这里不是定语从句，所以CD错误，B没有这种用法。参考译文：1972年，航天探测器水手10号发现水星的表面满是流星撞击的坑洞。

Kết quả (Anh) 1:

Answer: a: the predicate before the space is complete, space is a complete sentence, meaning is the object clause, found nothing. A right, the apposition of the planet Mercury. This is not attributive, so CD error, b there is no such usage. Text: in 1972, the space probe Mariner 10th discovery of mercury's surface is covered with a Meteor Crater.

Kết quả (Anh) 2:

Answer: A Analysis: The main front space that taste, after the space is complete sentences, according to the meaning of the title is made the object clause, found nothing phenomenon. A correct, the planet Mercury's do appositive. This is not the clauses, so that CD error, B no such usage. Passage: 1972, space probe Mariner 10 discovered Mercury's surface is full of meteor impact crater.

Kết quả (Anh) 3:

Answer: a analysis: spaces before the subject predicate and taste, space is a complete sentence, according to CET4 is object clause found what phenomenon. A right, the planet Mercury. This is not an attributive clause, so CD error, B no such use. Text: 1972, space probe seaman 10 discovered Mercury's surface is full of meteor impact craters.