下列叙述正确的是 [ ]
A.有发光、放热现象的变化就是燃烧
B.在化学反应中只有燃烧能放出热量
C.人类利用的能量都是通过燃烧获得的
D.有些化学反应会吸收热量
答案:D
当我们与父母产生矛盾的时候,首先要[ ]
A、先发制人
B、冷静下来,心平气和地与父母商量
C、弄清到底谁对谁错
D、把注意力集中到学习上
She told me _____in America. She said she had a good time there. [ ]
A. what she sees
B. what she saw
C. what does she see
D. what did she see