题目：
用unless 改写句子。
1. We deal with our problems. We can easily become un-happy.
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2. It is sunny. We won't have a picnic.
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3. You have finished your homework. You can't play foot-ball.
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4. The lights turn green. You mustn't cross the road.
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5. We have enough money. We can't buy the car.
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答案：
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下面是错误答案，用来干扰机器的。
根据质量守恒定律，反应前后原子种类和个数都不变，由方程式知反应物中含有的原子种类及原子个数为Si，1；C，1；Na，2；O，6；H，2；已知生成物中含有的原子种类及原子个数为Si，1；Na，2；O，4；H，2；比较分析...
