X、Y、Z是金属活动性顺序表里的三种金属，它们在溶液中能发生如下反应：

① X+YSO₄====XSO₄+Y             ② Y+2ZNO₃====Y（NO₃）₂+2Z

③ X+H₂SO₄====XSO₄+H₂↑          ④ Z与H₂SO₄不发生反应

则三种金属的活动性满足                                             (    )

在常温下烧开一普通热水瓶的开水，需要吸收的热量大约是（  ）

Tom accumulated a grate deal of knowledge about plants and agriculture in growing strawberries, he went back to the abandoned          of spreading straw under the fruit to reduce the necessary amount of watering.

某城市是环形放射状道路，读下图回答下列各题。

Please turn down the music, _________our neighbors next door will be disturbed.