问题
单项选择题
防爆阻火器芯由一知光滑平带和一条斜条波纹的不锈钢重叠缠绕而成，这两条钢带像螺丝一样，一层叠一层，卷成厚厚的一盘，中间形成众多的小三角形间隙，因为这些间隙（0.7mm）小于甲烷最大不传爆间隙（1.14mm）和甲烷的最大熄火直径（2.5mm），所以能有效地防止甲烷爆炸的传播和（）甲烷火焰的蔓延。
A.有助
B.阻止
C.减少
答案
参考答案：B
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防爆阻火器芯由一知光滑平带和一条斜条波纹的不锈钢重叠缠绕而成，这两条钢带像螺丝一样，一层叠一层，卷成厚厚的一盘，中间形成众多的小三角形间隙，因为这些间隙（0.7mm）小于甲烷最大不传爆间隙（1.14mm）和甲烷的最大熄火直径（2.5mm），所以能有效地防止甲烷爆炸的传播和（）甲烷火焰的蔓延。
A.有助
B.阻止
C.减少
参考答案：B
It was Molly’s job to hand her father his paper lunch bag each morning before he went to work. .One morning，besides his usual lunch bag，Molly __26__ him a second paper bag. This one didn’t look so good. It was __27__ and was held together with tape(胶带)． Her father kissed Molly and started off to work with the __28__ bags. On his lunch break，while he was eating，he looked __29__ the second old bag：two small dolls，three small stones and some coins. The busy father smiled，finished eating and __30__ away the bags，dolls and stones. That __31__ when they were having supper，Molly asked，“Where’s my bag，Daddy？” “What bag？” “The one I gave __32__ this morning.” “I left it at the office. __33__？” “I forgot to put this note in it，” she said. “Those are the __34__ I really love. I thought you might like to __35__ with them. You didn’t lose the bag，did you，Daddy？” “Oh，no，”he said，lying (说谎)．“I __36__ forgot to bring it home. I’ll bring it tomorrow.” When Molly put her arms around her father’s neck，he opened the __37__ that read：“I love you，Daddy.” Molly had given him her treasures(财富)，__38__ he had thrown them into the trash can(垃圾箱). So when he went back to the __39__，he went straight to the trash can and __40__ all of Molly’s things. He put the treasures inside the bag and carried it home.
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