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单项选择题

       在标准耐火试验条件下，对一墙体进行耐火极限试验，试验记录显示，该墙体在受火作用至0.5h时粉刷层开始脱落，受火作用至1.00h时背火面的温度超过规定值，受火作用至1.20h时出现了穿透裂缝，受火作用至1.50h时墙体开始垮塌。该墙体的耐火极限是（   

A．  0.5h
B． 1.2h
C． 1.0h
D． 1.5h
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未知题型
Pick out five appropriate expressions from the eight choices below and complete the following dialogue by blackening the corresponding letter on the Answer Sheet.
A.Hello B.I’m afraid
C.Excuse me D.Could you tell me
E.Thank you F.Sure Miss
G. Do me a favor please H. What can I do for you
Customer:【56】, but could you help me?
Clerk: With pleasurE.【57】?
Customer:【58】where I can find Mr. Zhang?
Clerk:【59】. Mr Zhang is upstairs.
Customer:【60】very much.
Clerk: Not at all, Miss.
(57)
单项选择题
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A．true
B．false
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