一个氘核(H)和一个氚核(H)结合成一个氦核并放出一个中子时，质量亏损为Δm，已知阿伏加德罗常数为N_A，真空中的光速为c，若1 mol氘和1 mol氚完全发生上述核反应，则在核反应中释放的能量为（    ）

根据短文内容，判断下列各句正误。

    Here's the weather report for today. It's going to be dry and windy for most of the day. Because of the wind, it's going to be cooler than usual. And the wind is going to be stronger in the evening.

    Now the report for the weekend. Our Saturday morning is going to be cloudy with little rain. And it's going to be cooler than today. In the afternoon the clouds will lift and the sun will come out. We shall have a warm evening.

    On Sunday the weather is going to change again. It's going to be fine and hot. But at noon a wind will come and it's going to be stronger in the afternoon. It's going to be a little cooler in the afternoon.