MIC是指A．最低抑菌浓度B．最低杀菌浓度C．抑菌圈直径D．敏感E．耐药

如图电路中滑动变阻器滑片P由a向b移动过程A，V示数变化情况为（　　）

A．A，V读数都是一直减小

B．A，V读数都是一直增大

C．A读数先增大后减小

D．V读数先增大后减小

VLAN在现代组网技术中占有重要地位，在由多个VLAN组成的一个局域网中，以下哪种说法是不正确的______。

A．当站点从一个VLAN转移到另一个VLAN时，一般不需要物理连接

B．VLAN中的一个站点可以和另一个VLAN中的站点直接通信

C．当站点在一个VLAN中广播时，其他VLAN中的站点不能收到

D．VLAN可以通过MAC地址、交换机端口等进行定义

输血后感染艾滋病，这是经（）

A.医源性传播

B.垂直传播

C.水平传播

D.接触传播

E.下行传染

《中华人民共和国固体废物污染环境防治法》规定：( )经中华人民共和国过境转移危险废物。

A．禁止
B．限制
C．不允许
D．避免

The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, (31) this is largely because, (32) animals, we stand upright. This means that our noses are (33) to perceiving those smells which float through the air, (34) the majority of smells which stick to surfaces. In fact, (35) , we are extremely sensitive to smells, (36) we do not generally realize it. Our noses are capable of (37) human smells even when these are (38) to far below one part in one million.
Strangely, some people find that they can smell one type of flower but not another, (39) others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate (40) smell receptors in the nose. These receptors are the cells which sense smells and send (41) to the brain. However, it has been found that even people insensitive to a certain smell (42) can suddenly become sensitive to it when (43) to it often enough.
The explanation for insensitivity to smell seems to be that the brain finds it (44) to keep all smell receptors working all the time but can (45) new receptors if necessary. This may (46) explain why we are not usually sensitive to our own smells—we simply do not need to be. We are not (47) of the usual smell of our own house, but we (48) new smells when we visit someone else’s. The brain finds it best to keep smell receptors (49) for unfamiliar and emergency signals (50) the smell of smoke, which might indicate the danger of fire.

A．introduce

B．summon

C．trigger

D．create