无子女就是未生育子女吗？
参考答案：
不是，无子女就是指未生育，未收养和生育或收养子女后子女死亡的。
_____ has been introduced to the students to help them make progress.
A．Many books as well as advice
B．Some advice as well as many books
C．Not only some advice but also many books
D．Some advice and many books
五色椒的观赏部位是（）
A、花
B、果实
C、茎
D、叶
