A：鼓膜
B：半规管
C：前庭
D：耳蜗
某农户发现自己的杨桃果树历经几十年后，生长态势不那么好了，近期他砍伐了一棵，发现树茎有了中空．请问中空部分缺失的主要是茎的（ ）
阅读下列短文, 从每题所给的四个选项(A、B、C、D)中选出最佳选项。
Film Reviews(影评)
James
I really enjoyed this movie．It's a fun movie for the whole family．I had really good laughs and enjoyed being there
Sam
I would recommend this movie to everyone．In fact, when you go to see it together with your family or friends, I think this movie has something you will really enjoy!
John
I have seen some movies of this kind, but this one is the best．It is so well made．Some of the scenes are so beautiful．
Mary
I went to see this movie with my nine-year-old daughter this Tuesday．I really didn't know too much about it before．My daughter and I were surprised at how funny it was．Just couldn't help laughing．I would recommend this movie to the whole family .
