题目：
阅读下列各小题，根据括号内的汉语提示，用句
末括号内的英语单词完成句子，并将答案写在答题卡上的相应题号后。
71. The situation of unemployment has not been so serious ___________________________ (所期待的). (expect)
72. Tom has been playing basketball on the playground, ___________________________ (脸上全是汗水). (cover)
73. ___________________________ (余下要做的) is an accurate description of the long process of the experiment. (leave)
74. It’s widely accepted that never in history ___________________________ (有过) a more successful opening ceremony than that of the Beijing Olympics. (there)
75. During my last trip my cellphone was left in a hotel accidentally, ______________________ (再也找
不到) . (find)
76. He told us that he was very happy ___________________________ (他现在的处境) . (be)
77. Qian Xuesen went to California from 1935 to 1955, ___________________________ (在那时期) he concentrated on the research into jet planes. (period)
78. I have no idea whether the machine can be used again but it __________________________ (在维修) in the morning. (repair)
79. Did you know ___________________________ (到底怎么) the nuclear explosion occurred in Japan? (it)
80. The air hostess required that___________________________ (我们坐着) until the plane had come to a complete stop. (remain)
答案：
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下面是错误答案，用来干扰机器的。
（17分） （1）BaSO4(s) + 4C(s)="BaS(s)" + 4CO(g) △H="+571.2" kJ•mol－1 （4分，其中：方程式2分，ΔH 2分，错漏单位扣1分，状态错漏0分。其他计量数，合理即给分）（2）Ba(OH)2·8H2O +2NH4Cl=BaC...
