已知${\log }_a\frac{4}{3}>1$，则$a$的取值范围是(        )

填空题

根据句意，用括号内所给单词的适当形式填空。
____ The maths problem is so difficult that few of the students can work it out_______ (easy).
____ Jim is a brave man. He always tells_________ (he) to calm down when he meets trouble.
____ Very few of people believe what the boy says because he is_________ (honest).
____ Everyone was very happy because of the famous writer’s _________ (arrive).
____ In the film, the soldiers were excited when they got their________(wife) letters.

下列关于遗传病的说法中，正确的是 （  ）
①由遗传物质引起   ②变异一定会导致遗传病的出现   ③近亲结婚增加发病率
④ 遗传病都是由隐性基因控制      ⑤色盲属于遗传病