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问题
多选题
高等动物细胞中，不含磷脂分子的细胞器有：[ ]
A．核糖体
B．高尔基体
C．内质网
D．中心体
答案
AD
判断题
情景综合分析法的预测期一般是3～5年。（）
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选择题
The coal miners ____ in the coal mine for 10 hours before we came to their rescue.
A. had trapped
B. had been trapping
C. had been trapped
D. would have been trapped
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