进行无性生殖的生物，其可遗传的变异来源是（） A.基因突变和基因重组 B.基因突变和

所谓“城市综合交通”即是( )。

A．一种独具特色、并同样由多种类型交通组合而成的交通系统
B．可分为地上交通、地下交通、路面交通、轨道交通、水上交通
C．城市交通的主体，分布在城市的每个地方；货运交通是货物的流动，其主要部分分布在城市外围的工业区和仓储区
D．涵盖了存在于城市中及与城市有关的各种交通形式

以下哪项不是面色发黑所属病证（）

A.水饮

B.痰湿

C.肾虚

D.寒证

E.血瘀

A moment’s drilling by the dentist may make us nervous and upset. Many of us cannot stand pain.

To avoid the pain of a drilling that may last perhaps a minute or two, we demand the "needle"— a shot of novocaine (奴佛卡因) -that deadens the nerves around the tooth.

Now it’ s true that the human body has developed its millions of nerves to be highly aware of what goes on both inside and outside of it. This helps us adjust to the world. Without our nerves—and our brain, which is a bundle of nerves— we wouldn’t know what’s happening. But we pay for our sensitivity. We can feel pain when the slightest thing is wrong with any part of our body. The history of torture is based on the human body being open to pain.

But there is a way to handle pain. Look at the Indian fakir(行僧) who sits on a bed of nails. Fakirs can put a needle right through an arm, and feel no pain; This ability that some humans have developed to handle pain should give us ideas about how the mind can deal with pain.

The big thing in withstanding pain is our attitude toward it. If the dentist says, "This will hurt a little, it helps us to accept the pain. By staying relaxed,’ and by treating the pain as an interesting sensation, we’ can handle the pain without falling apart. After all; although pain is an unpleasant sensation, it is still a sensation, and sensations are the stuff of life.

The sentence "But we pay for our sensitivity."in the third paragraph implies that（）

A. we should pay a debt for, our feeling

B. we have to be hurt when We feel something

C. our pain is worth feeling

D. when we feel pain, we are suffering it

人们需要坚决维护若无充足理由没有权力毁灭其他生命这一道德和法律底线。否则，将有可能打开滥用和残害自然生命的大门。一个偷猎者丧命于野生动物口中，人们为他叹息；但如果他声称是为了保护自己而打死了受保护的野生动物，人们仍然不能让他逃脱法律的惩罚。
对本段中有关内容的理解，正确的一项是( )。

A．人们不维护对待自然生命的道德和法律底线，就会导致残害自然生命、破坏生态平衡的后果
B．一个偷猎者有武器而不用，丧命于野生动物是值得同情的
C．为维护对待自然生命的道德和法律底线，应惩罚声称为保护自己而打死受保护的野生动物的偷猎者
D．作者认为，野生动物是应该受到保护的，而偷猎者受到惩罚和丧命于野生动物完全是咎由自取，不值得人们同情，今后更要加大打击的力度