1．This hypothesis states that environments that are too clean may actually make the ______ system develop oversensitive responses.
A．mental
B．nervous
C．immune
D．physical
2． Tennessee’s population is nearly two-fifths rural, and no single city or group of cities the state.
A．dominates
B．manages
C．manipulates
D．controls
3． Long______ to harmful pollutants is most likely to lead to a decline in health.
A．contact
B．touch
C．use
D．exposure
4. The manager was told when he was ______ that his was a pressure job.
A. appointed
B. pointed
C. assigned
D. disappointed
5. Her husband is interested in designing electronic ______.
A. management
B. safety
C. devices
D. routine
【答案解析】
1．C。mental心理的；nervous紧张的；immune免疫的；physical肉体的。根据题意可知，此处应用immune，故答案为C。
2．A。dominate占优势；manage管理；manipulate操作，操纵；control控制，支配，管理。根据题意可知dominate符合题意。故答案为A。
3．D。contact接触，联系，交往；touch触摸，接触；use使用，利用；exposure显露，暴露。这里的意思是“长期接触有害污染物……”，exposure to表示了这一概念。故答案为D。
4.A。appoint任命，委派；point指，指向；assign分配，交给；disappoint使失望。根据题意可知，此处应填“任命，委派”。故答案为A。
5.C。management管理，经营；safety安全，平安；device装置，装备；routine例行公事。根据题意可知，此处应填“设备”。故答案为C。
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