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小灯泡L1和小灯泡L2串联在电源两端，L1两端的电压为3V，L2两端的电压为1.5V，则电源电压为______V．

答案

∵两灯串联，

∴电源电压：

U=U1+U2=3V+1.5V=4.5V．

故答案为：4.5．

判断题

我国开放式基金的申购金额为净申购金额。( )
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基础训练篇（5）

It is known to all (1)___________ the Chinese diet is considered to be the (2)__________(healthy) in the world because it (3)__________ (contain) a lot of fruit and green vegetables. It is rich (4)___________ fiber and low in sugar and fat.

How (5)_____________ the Western food? It has too much fat in the form (6)______________ potato chips, chocolate and so on.  It is also rich in sugar in the form of cakes, soft drinks, etc. As (7)______ _ result, the (8)________________(west) usually become very fat and have bad (9)____________ (tooth), and many of them even die at an early age from heart (10)______________ (ill).
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