如图14所示是探究平面镜成像特点的实验装置图。将一块玻璃板竖直架在一把刻度尺的上面，并保持玻璃板与刻度尺垂直。再取两根完全相同的蜡烛A和B分别竖直置于玻璃板两侧的刻度尺上，点燃玻璃板前的蜡烛A，进行观察和调整。用此实验可以研究：①像与物大小的关系；②像与物到平面镜距离的关系；③平面镜成的是虚像还是实像。
（1）选用刻度尺的作用是为了便于比较_________；（选填“①”、“②”或“③”）
（2）选用两根完全相同的蜡烛是为了比较________；（选填“①”、“②”或“③”）
（3）在利用蜡烛B确定出蜡烛A所成像的位置后，移去蜡烛B，并在其所在位置上放一光屏，则光屏上_________（选填“能”或“不能”）接收到蜡烛A的像。

阅读理解

读下面的文章，然后将吉姆早餐前的活动排序。

　　Jim has a farm. He has a lot of cows there and he sells their milk, He does not milk the cows by hands; he has an electric milking machine(电动挤奶机). He gets up very early every morning, milk the cows with his ready, puts it i very big cans, washes the milking machine and the buckets(桶), puts the milk cans out ad then has his breakfast. At about 8 o'clock a big truck comes and collects his milk-cans. It also collects milk from other farms.

　　After breakfast, Jim goes to his desk and writes letters and bills(账目)and other things. When I visit him, he says,“Do you know, Bill, a farmer has a lot of paper-work to do now. He is like a clerk(职员) in an office.”Jim loves his farm, but he hates paper-work.

　　After he finishes it, he cleans his cow-sheds(牛棚)and then does some work in his vegetable garden.

　　He is always very busy, and his wife is, too.

　　①gets up

　　②lets the cows out into the fields

　　③washes the milking machine and buckets

　　④put the milk-cans out and then has his breakfast

　　⑤milk the cows with his machine

　　⑥puts the milk in very big cans

　　⑦gets the milk ready

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