自发性结实
参考答案：
不经授粉，子房发育不受外来刺激，完全是自身生理活动造成的单性结实。
根据首字母填单词。
1. Danny wants to go s______on Sunday.
2. Wangfujing isn't f_______. We can walk there.
3. He wants to buy a shirt. He looks in fifteen s______.
4. Squirrels (松鼠) each have a long t_______.
5. — What t_____is it now? — It's 6 o'clock.
2005年与2000相比，留学出国人数增加了约多少人（）
A．60000
B．80000
C．85000
D．90000
