[单选题]下列说法正确的是

正确答案 ：A

核能是指原子核发生变化时所释放的能量

[单选题]下列不属于固定成本的是（ ）。

正确答案 ：D

外购动力费

[多选题]②将铁粉和铜粉的混合物放入硝酸银溶液中，反应结束后，对剩余固体成分的判断正确的是______。

正确答案 ：AC

肯定有银

可能有铁

解析：AC

[单选题]23．The moon is bright because__________

正确答案 ：D

it can get light from the sun

解析：23.D【解析】由第三段最后一句“It gets its light from the sun”可知。

[单选题]BRadio and television are very popular in the world today． Millions of people watch TV．Perhaps more people listen to the radio．The TV is，of course，more useful than the radio． On TV you can see and hear what is hap-pening in the world．Now radio is still with us． And the number of listeners is becoming larger． One reason for this is the invention of the transistor(半导体) radio． A transistor radio is sometimes very small． It is very easy to carry． You can put one in your pocket and listen to it on the bus or on your bike when you go to work． It is better．for blind people． The sight(视力J) of many old peo-ple is not good enough to watch TV． Then，when people are working，they can't watch TV， but they can listen to music or news over the radio． What-s more，radio is much cheaper than TV．

正确答案 ：C

are both widely used

解析：26.A【解析】由第一段可知。

[单选题]．压瘪的乒乓球放入热水中重新鼓起，是因为球内的气体分子

正确答案 ：C

间隔增大

[单选题]—Doyouknow________theCapitalMuseum?—NextFriday.

正确答案 ：B

whentheywillvisit

[单选题]6． Henry has two good friends here and he has __________one in London． '

正确答案 ：C

another

[单选题]6． Don-t worry! I-m sure you’ll _________ your classmates if you work hard at your lessons．

正确答案 ：A

catch up with

解析：6.A【解析】题意“不用担心，如果你努力学习功课，你会赶上你的同学的”。catch up with跟上；ag ree with同意；get on well with和……相处融洽#make friends with与……交朋友。故答案为A。

[单选题]下面句子中加粗词语使用正确的一项是( )

正确答案 ：D

金融危机爆发后，甲型H1N1流感病毒又乘机横行，这对美国来说可真是祸不单行啊！

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