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问题 单项选择题

下列选项中，对于催化剂抗镍性能大小次序正确的是（）。

A、全白土型>半合成型>全合成型

B、全白土型>全合成型>半合成型

C、全合成型>全白土型>半合成型

D、半合成型>全合成型>全白土型

答案

参考答案：A

填空题



As crime skyrockets in many communities, people are finally beginning to look for long-lasting effective answers to stem the tide of juvenile crime. Reaching the youth who have committed a crime before they become (1) is an essential step in reversing the crime trend. One (2) may be the establishment of teen court. Teen court is known as a sentencing court for youths who have (3) . Teen courts primarily deal with first-time offenders. After arrest, the young offender must (4) to the charge in juvenile court. With (5) , the offender agrees to be sentenced and abide by the decision of peer jury (6) . Another essential component to teen court is that, as part of the sentence, the offender must sit in on one of more future peer juries to (7) for other offenders. For example, a county teen court in Illinois gives young offenders a chance to (8) their arrests from their permanent record by (9) or other duties ordered by the court. Teen court is not a trial court. All teens admit their guilt and (10) a sentence given to them by a jury of their peers. A judge is present to (11) of the court. The teen court alleviates the strain on the (12) and has been implemented in (13) since the first teen court opened in Odessa, Texas. Beside giving the offender a second chance, it gives the youth (14) in the judicial process.
The purpose of the teen court, aside from sentencing youth offenders, is to (15) both the offenders and the teen volunteers while simultaneously promoting (16) between defendants, the community, and the police. By offering this (17) system, teen court allows those teens who have made a bad decision an opportunity to (18) and learn from it. At the same time those teens learn (19) . The police, the community, and the (20) .
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单项选择题

处理煤尘爆炸的首要问题是（）。

A、防止二次爆炸

B、防止火灾事故

C、防止引起瓦斯爆炸
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