题目内容
【小题1】We must learn and help _________ __________( 互相 ).
【小题2】The shop sells (出售) many school things, _____ _____ ( 例如 )pens, pencils，rulers, erasers and so on.
【小题3】She ________ _________ ( 有空 ) on Saturdays.
【小题4】Mrs. Smith likes _________ some ________( 购物 ) on Sunday morning.
【小题5】Li Lei _____ _____( 不得不) go to school on foot today because his bike is broken.
【小题1】each other
【小题2】such as
【小题3】is free
【小题4】doing shopping
【小题5】has to
解析【小题1】考查固定短语。“互相”是each other。句意“我们必须学会相互帮助。”故填each other。
【小题2】“例如”用such as或for example。for example后需要用逗号，排除。故填such as。
【小题3】考查固定短语。be free“有空”。She是第三人称，故用is。故填is free。
【小题4】考查固定短语。“去购物”用do some shopping。故填doing shopping。
【小题5】“不得不，必须”用must或have to。Have to表示客观原因，常意为“不得不”。主语是第三人称单数，故用has to。
名师金手指领衔课时系列答案Put an ice cube from your fridge into a glass of water. You have a piece of string(线) 10 centimeters long. The problem is to take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.
You may ask your friends to try to do that when you are having dinner together. There is a saltcellar on the table. You must use salt when you carry out this experiment.
First you put the string across the piece of ice. Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt. But when it melts, it will lose heat. The cold ice cube will make the salt water freeze(结冰) again.
After a minute or two you may raise the piece of string and with it you will raise your piece of ice!
This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice. If you don’t put enough salt, the water will freeze again.
【小题1】We must use when we carry out this experiment.
| A．a fridge | B．some food | C．a table | D．some salt |
| A．More than three minutes. | B．Five minutes or two. |
| C．Only one minute or two. | D．About ten minutes. |
| A．physics | B．biology | C．chemistry | D．maths |
