下列几则公益广告，从主观感受和客观效果看，用得不够得体的一项是（）。
A. 粗口成脏，话脏嘴贱——寄说话粗鲁者
B. 让一让心畅路畅.抢一抢心堵路堵——寄驾车者
C. 带走您的垃圾，留下您的品格——清洁寄语
D. 先下后上能下能上.一哄而上难上难下——乘车寄语
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由公务员、医生、教师等行政事业单位或金融、通讯、电力、烟草等优势行业正式在编人员提供保证担保（包括单人和多人担保）的农业产业链农户贷款，单户贷款额度最高不超过（）。
A. 10万元
B. 20万元
C. 30万元
D. 50万元
Which statement describes the process of dynamically assigning IP addresses by the DHCP server?（）
Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
B. Addresses are permanently assigned so that the hosts uses the same address at all times.
C. Addresses are assigned for a fixed period of time, at the end of the period, a new request for an address must be made.
D. Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease.
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