阅读理解
I was woken up by a strange sound. I saw something moving by my window. I was terrified and ran downstairs. I found my mom in the kitchen, getting my brother ready for school.
"Mum, did you hear anything? I, uh. I thought I saw an alien."
"Are you all right? Just a dream! " Mum answered.
Then I went back to my room. As I walked to the window, I cried, I saw a little alien, no more than three feet tall, with big and black eyes. It tried to run between my legs and escape through the window. Although I was scared, for some reason, I squeezed (挤) my legs together in time to catch it. It took out something and hurt me. I felt a terrible sense of nothingness and fainted (晕倒). Then I woke up.
At first, I could hardly move. I wasn't sure whether it was a dream or not. I pulled myself out of the bed and walked downstairs. I saw my mum in the kitchen. She was really getting my brother ready for school, wearing her pink clothes. Then I realized it was just a dream because in my dream she was wearing her work clothes.
From then on, I always dreamt about aliens and all the dreams felt so real. At that time, I really thought maybe I had some kind of relationship with aliens. About two months later, I stopped having such dreams. Later I realized that l used to have those dreams because I always read books or watched TV programs about aliens before I fell asleep!
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四个小磁针，分别放置在通电螺线管的附近和内部，如图所示。其中哪一个小磁针的指向是正确的（ ）