题干

用天平和量筒测出金属块的密度.将托盘天平放在水平台面上.在调节天平横梁平衡时,先用镊子把游码轻轻拨至标尺左侧零位,发现指针的偏转情况如图甲所示,这时应将横梁右端的平衡螺母向____侧调节,直至指针指在分度盘的中央刻度线上.将金属块放在天平左盘并向右盘添加砝码及移动游码,直至天平平衡.右盘中的砝码及游码在标尺上的位置如图乙所示,则金属块的质量是____ g .把金属块放在装有 30cm3 水的量筒中,量筒内水面的位置如图丙所示,则金属块的密度是____ kg/m3
       
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Cell Phone Madness

    When I opened the box at my 12th birthday party, I couldn't believe my eyes. I had really got a cell phone!

    As soon as I got to my school the next morning, I showed off my phone and asked everyone for their number. It felt like I didn't even exist in that class anymore. I wouldn't pay much attention to the teachers because I was too busy on my phone. Luckily I didn't get caught using it. I was pretty sure that the teacher did notice that I stopped paying attention to her because a week later we took a test and I got Grade D for the first time. To make matters worse, my mom had to sign the test. It was hard to show my mom the paper. She never expected “D” on my tests. Well, finally, I showed her and she couldn't believe it. She was angry but most of all, she was disappointed(失望的).

    Weeks passed and my parents started to dislike the fact that I had a phone. They would say, “We have noticed that you never pay attention to us. It's like you have your own little world now and we don't communicate as much with your phone.” I acted like they were wrong, but then I started to wonder if it was true that I was spending too much time on the phone.

    A week later I tried going a whole day without a cell phone and it didn't go that badly. I had so much fun because I was actually spending time with my family and paying attention to them. From that day, I had a different point of view towards cell phones.

    Phones really take you away from the rest of the world.I'm not saying that phones are bad and not to use them, but you do have to spare some time to spend with your family and not get stuck with your phone all day. My phone took away time from my homework and from my family. It also affected my grades.

    I will keep using my phone, but I will have it under better control.