试分析民国初期出现名记者群体的原因。

Lions are big and strong.They have bright eyes, sharp teeth and black points on their brown bodies.So they look beautiful.

Lions can run fast.They are good at catching other animals.Lions like living as a family until baby lions are 2 years old.A lion lives alone during most of its life.

Now, many hunters hurt lions for their fur and meat.They sell their meat to people for meals.They use their fur to make clothes and bags.We must stop this.It is wrong for people to kill lions.We can write to newspapers about the danger the lions are facing.We should tell the government and people about the problems.If we do nothing, soon there will be no lions in the world any more!

小题1:What are lions like?

A．Big and strong

B．Big and light

C．Black and white

D．Bright and Slim.小题2:What colour is the lion’s points?

A．Black

B．Brown

C．Blue

D．White小题3:When do baby lions begin to live alone?

A．20 years old

B．12 years old

C．2 years old

D．22 years old小题4:What do people hunt tigers for?

A．Fur

B．Fur and leather bags

C．Fur and meat

D．Leather bags and bones小题5:To save lions, what are NOT in the passage?

A．Write to newspapers.

B．Tell people about the problems.

C．Do a lion count once a year.

D．Ask the government to help.

微生态学

关于纵隔肿瘤症状，下述哪项是错误的

A．其症状的程度及发生时间与肿瘤的部位，生长速度相关
B．大部分患者在体检时偶然发现
C．每一类肿瘤都有相应的症状
D．一部分患者有胸闷，胸痛症状
E．一部分患者有压迫相应器官的症状

引起传导性聋的常见先天性疾病包括（）。

A.外耳道闭锁

B.鼓膜、听骨发育异常

C.蜗窗、前庭窗发育异常

D.鼓室发育异常

E.听骨链畸形

为什么选择是育种的中心环节？