正确答案: A

5 ：4

题目：电炉丝断了，去掉1/5后，仍然接在原来的电源两端，则在相同时间内产生的热量与原来产生的热量之比为

解析：A

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学习资料的答案和解析：

[单选题]15．

why

解析：15.B【解析】由下一句“Because they' re stressed out!”可知应选why。

[单选题]B

Hi! My name is Tina． I’m an American girl． I like sports and I like ping-pong best． Do you know my favorite ping-pong star? She's a Chinese girl and she's very beautiful． Her name is Wang Nan． Do you know her? I have a great photo of Wang Nan． It's on the wall of my room． Welcome to my room． It's a nice room． Look! 12 soccer balls are on the table． 10 volleyballs are under the table． Behind the door are 12 basketballs． Only 5 baseballs are in my drawer． But I don’t have a tennis racket． I don't like to play tennis． ( )26．Wang Nan is a ________star．

ping-pong