皮皮学，免费搜题
登录
搜题
【简答题】
裸子植物生殖器官的演化趋势是：孢子叶由散生到聚生成各式______，大孢子叶逐渐______，雄配子体由具吸器发展为具______，雄配子由游动的______发展到______，颈卵器由退化、简化发展到______。这些演化使裸子植物有可能更完善地适应______生活条件，而达到较高的系统发育水平。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Mary said that Hemingway was her______writer and that she had read nearly all of his novels.
A.
famous
B.
popular
C.
common
D.
favorite
【单选题】The writer had plenty of time to spare as his train ______.
A.
was leaving later than scheduled
B.
was not leaving for another hour
C.
was not scheduled to leave
D.
was delayed for some reason
【单选题】The writer and his friend______.
A.
had never been to that bar before
B.
did not know if they had come to the right place
C.
asked somebody the name of the bar
D.
had little difficulty in finding the bar
【单选题】When the writer first came to the capital______.
A.
he had been very reluctant to leave his mother
B.
his mother had not wanted him to leave home
C.
he had made no preparations for his journey south
D.
he had sent his possessions on ahead in a trunk
【单选题】The writer wanted to resign because ______.
A.
he had serious trouble with his boss
B.
he got underpaid at his job for the Globe
C.
he wanted to be engaged in the new media industry
D.
he had found a better paid job in a publishing house
相关题目：