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问题 单项选择题

嗜肺军团菌的特性，正确的是（）。

A.常用革兰染色，阴性

B.最适生长温度为30℃

C.营养要求高，在含血清的培养基上生长

D.兼性厌氧菌，胞外寄生

E.可引起医院感染

答案

参考答案：E

解析：

嗜肺军团菌革兰染色阴性，但予以着色，所以通常用镀银染色或Giemsa染色。最适生长温度为35～36℃。专性需氧，营养要求高，铁和半胱氨酸为必须生长因子。

单项选择题

The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952, on one small Japanese island, scientists dropped some (21) in the dirt for the monkeys. The monkeys liked their taste, but they found the dirt (22) .
One clever 18-month-old monkey found she could (23) the problem by washing the sweet potatoes in a nearby river. She taught this to her mother. Her (24) also learned this new way and they taught their mothers too.
All the younger monkeys (25) learned to wash the dirty sweet potatoes to make them (26) to eat. But many old monkeys found it very hard to learn this and still ate the (27) sweet potatoes.
Then something very strange (28) In the autumn of 1958, scientists found that the monkeys on other nearby (29) began washing their sweet potatoes too. Scientists still don’t fully understand how this knowledge was (30) from one island to another.

Ⅱ. 完形填空

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阅读下面短文，掌握其大意，然后再各题所给的四个选项(A、B、C和D)中选出一个最佳选项。

A．lost

B．dropped

C．passed

D．left
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单项选择题

根据《人民币银行结算账户管理办法》，银行结算账户管理档案的保管期限为银行结算账户撤销后（）。

A、10年 

B、20年 

C、5年 

D、15年
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