阅读对话，判断正误。

    Pedro: Hi, Li Lei. When do you start class in the morning?

    Li Mei: Usually at 8 o'clock.

   Pedro: It’s early. In Spain we start class at 9 o'clock.

   Li Mei: When do you usually eat dinner, Pedro?

   Pedro: At 9:30 or 10:00 p.m.

   Li Mei: Wow! That's too late. I always go to bed at 9:30. What do you do on the weekend?

   Pedro: I often play football with my friends. Sometimes I go shopping with my mum.

   Li Mei: Sounds interesting. I usually wash my clothes and clean my room at home.

某家庭用燃气热水器将质量为100kg，温度为20℃的自来水加热到50℃，消耗的天然气体积为1m³（假设天然气完全燃烧）．已知水的比热容为4.2×10³J/（kg•℃），天然气的热值为3.2×10⁷J/m³．求：

对标有不同编号的6件正品和4件次品的产品进行检测，不放回地依次摸出2件．在第一次摸出正品的条件下，第二次也摸到正品的概率是（　　）

对于复数a,b,c,d，若集合S={a,b,c,d}具有性质“对任意$x,y\in S$，必有$xy\in S$”，则当$\{\begin{array}{c}a=1\\ b^2=1\\ c^2=b\end{array}$时，b+c+d等于(　　)