漫画《地球的困惑》给我们的哲学启示是[ ]
A．要充分发挥主观能动性
B．要保护环境，绿色消费
C．要认真履行社会责任
D．要作出正确的价值选择
答案：D
下列不具有双层膜的细胞结构是[ ]
A．叶绿体
B．核糖体
C．线粒体
D．细胞核
—How many souvenirs _____ you _____ in the shop?
—I bought only one. [ ]
A. did, bought
B. does, buy
C. did, buy
