题目

_______ he is only 12, he often goes to the old people’s home to perform plays           for the old people as a volunteer.         A. If    B. Since    C. Though    D. Because 答案：C--- Do you know the reason _________ pilots turn off the plane’s lights before taking off? ---The practice is for the passengers to adjust to the dark _________ an emergency. A．why; for fear that                  B．for which; in case of C．how; for fear of                   D．that; in case