A:兔的牙齿没有分化
B:兔的口腔内没有唾液腺
C:兔的盲肠发达
D:兔没有阑尾
If a girl doesn't know ________ to wear or ________ to dress up, she can ask her best friend for help.
下列名称中,属于地质构造的是 ( )