【简答题】(人们)普遍认为鸟类是从恐龙进化而来的。Birds are widely believed to have ________ dinosaurs.
【简答题】Birds are widely believed to have ________ ________ dinosaurs.(由...进化而来)
【单选题】This passage deals mostly with ______.
【单选题】根据基本风险的含义,下列风险中属于基本风险的是( )。
【简答题】阅读短文,填空。 Birds Although (虽然) all birds may not look the same, all birds have certain things in common (共同点). All birds are warm-blooded. This means that their body temperature always stays the same. B...
【单选题】根据基本风险的含义,下列风险中属于基本风险的是( )。