在研究生物进化的过程中，____ 是非常重要的证据。
多音字组词。
好hǎo____ hào____
行háng____ xíng____
A. What's the matter?
B. It's red and white.
C. Yes, it is! Thank you.
A: ____
B: I can't find my ball.
A: What colour is your ball?
B: ____
A: Look! Is this your ball?
有“非洲屋脊”之称的地形区是( )
