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【简答题】
请用化学方程式表示出化学知识的应用： （1）用MgSO 4 急救BaCl 2 引起的中毒______； （2）铝制水壶中的水垢（主要成分为碳酸钙）可用盐酸除去______，但盐酸用量过多会损坏水壶，这是因为______； （3）照明弹靠镁粉的燃烧照亮夜空______．
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【单选题】There is no rice in the bag ,___________?
A.
is it
B.
isn't it
C.
is there
D.
isn't there
【单选题】Sorry, there is no Yangzhou Fried Rice now. It _____ only for lunch and supper.
A.
serves
B.
served
C.
is served
D.
is serving
【简答题】阅读理解。 If there is no rain, there will be no water to drink. We can only live for about three days without water. If there is no rain, we’ll have no water to brush our teeth. We will have no water to t...