下列松科植物中，可以作先锋树种的是（）
下列松科植物中，可以作先锋树种的是（）
A.马尾松
B.油杉
C.黑松
D.雪松
正确答案：马尾松
- 1.Please tell the function(s) of the underlined part(s) in each sentence.Tom flung open the door and rushed out of the room, totally losing his calmness.
- 2.A compliment is a part of a sentence that gives more information about the subject, or, in some structures, about the object.
- 3.Many phrases can be used as adverbials referring to time, causes, conditions, concession, purposes, and exceptions, etc.
- 4.Adverbial isn't required for a complete sentence, but is necessary for specific image presentation.
- 5.Attributives refer to words, phrases or clauses that are used to modify nouns or pronouns.
- 6.Which of the underlined What- structures functions differently from the others?
- 7.Which of the underlined parts in the four sentences functions differently from the others?
- 8.Please identify the subject of the main clause in the following sentence.（）Then, with World War II, came the development of the weapon that has since become a（） general threat to life on earth: the atomic bomb.
- 9.Eric nearly always wins the science award.（）That's because his projects are （）.
- 10.The early achievements in space exploration were all crash-landings, each spacecraft（）（）.