下列生态系统中，生物种类的多样性和基因的多样性体现最突出的是 [ ] A．草原生

正常成人颈部完全伸展时，甲颏间距应大于（）

A.5.0cm

B.6.0cm

C.6.5cm

D.7.5cm

E.>8.0cm

For years, the prescription for maintaining health hearts had been vigorous exercise—running, swimming, dancing—whatever it took to get the heat rate up and keep it there for 20 to 30 minutes at least three times a week. But that message changed.
A panel of exercise researchers convened by the Centers for Disease Control and Prevention and the American College of Sports Medicine reported that people needn’t exercise vigorously to improve their health.
The American Heart Association has weighed in with similar recommendations. But despite this apparent consensus, there is considerable disagreement in the exercise research community about whether the recommendations are amply supported by scientific data.
Policy-makers caught in the middle of this disagreement are in a difficult position. It’s a classic dilemma confronting health experts in areas ranging from mammography (哺乳动物学) to diet, where the scientific data are not clear-cut.

分公司也具有独立的法人资格。（）

下列定影液配方，错误的是

A．硫代硫酸钠

B．亚硫酸钠

C．碳酸钠

D．钾矾

E．冰醋酸

注意：下面出现的“考生文件夹”均为K：\K01\15010008。 ******本题型共有5小题****** 1．在考生文件夹下QI\XI文件夹中建立一个新文件夹THOUT。 2．将考生文件夹下HOU\QU文件夹中的文件DUMP.WRI移动到考生文件夹下TANG文件夹中，并将该文件改名为WAMP.WRI。 3．将考生文件夹下JIA文件夹中的文件ZHEN. STN复制到考生文件夹下XUE文件夹中。 4．将考生文件夹下SHU\MU文件中的文件EDIT. DAT删除。 5．将考生文件夹下CHUI文件夹中的文件ZHA0. PRG设置为隐藏属性。