关于群落的一些特点的叙述中，正确的有( )。 A．在一个群落中，物种是多样的，生物

On Wednesday morning, Tom was walking along the streets. Suddenly he heard two shots. It came 

from the bank. He ran to the bank but saw a man coming out of.  The man was short and fat with red hair. He has a bag of money and a gun in his hands. The man ran away quick and was not caught that morning. That afternoon Tom went a cinema. He saw the thief again and phoned the police. They caught the thief. How an exciting day  for Tom! The bank gave him 100 dollars for a reward.

下列给予的护理措施中，不正确的是

A．根据医嘱及时给予甘露醇

B．密切观察神志变化

C．给予物理降温

D．及时采血测定碳氧血红蛋白

E．给予持续低流量吸氧

对于发现不应当追究刑事责任或者取保候审期限届满的，应当及时解除取保候审，但不必通知被取保候审人和有关单位。( )

检测化学毒物的基因突变作用选用（）

A.微核试验

B.显性致死试验

C.细菌回复突变试验

D.骨髓染色体畸变试验

E.程序外DNA合成试验

引文追溯法