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【单选题】
听力原文： Russian commandos have stormed a hijacked bus in the southern Tajikistan Republic and freed all 18 hostages aboard. Security officials say the two gunmen who had held the bus for 8 hours were arrested. Officials say no one was seriously hurt in the take-over by a newly-created anti-terrorist squad. The gunmen seized the bus Wednesday night. They had demanded more than a million dollars' ransom and a helicopter to escape. Their motives are unclear although they reportedly told police they needed the money to help drug-addicted friends. How many hijackers are involved in the news?A.
18.
B.
2.
C.
8.
D.
1.
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【多选题】教育干预作为一种对学习障碍的治疗手段，主要包括：( )
A.
直接改善基本技能的措施
B.
教给学生一些理解视、听材料的技巧
C.
通过对听、说、理解和记忆进行的常规教育改善学生的认知技巧的措施
D.
教给学生一些行为技能，以弥补其在阅读、数学或书写表达方面可能存在的特殊问题
E.
帮助学生树立自信
【简答题】元素在地壳中的平均质量分数,称为( )。