问题 选择题

把质量相同的铁块和铜块,分别挂在两个完全相同的弹簧秤下,然后将它们全部进入水中,则弹簧秤的示数是(  )

A.挂铁块的示数大于挂铜块的示数

B.挂铁块的示数小于挂铜块的示数

C.挂铁块的示数等于挂铜块的示数

D.不知浮力大小,无法确定

答案

因为m=m,ρ>ρ,所以由ρ=

m
v
分析可知v<v

根据阿基米德原理F浮力=ρgv分析,铜、铁块浸没在同种液体中,而v<v,所以F浮力铜<F浮力铁

由力的平衡知识可知,弹簧秤的示数F=G-F浮力,所以,挂铁块的示数小于挂铜块的示数;

故选B.

写作题

I have a friend who had financial problems and needed my help occasionally.

He was in his final year in University while I was in my third year. He needed some money for school fees and other academic purposes, and he came to me. Being a student, ______,but I gave him what he needed on the agreement that he would pay back. I didn’t bother him after that. I never asked when he’d pay back.

Later on,after he finished school,he got into another period of deep financial stress and called me on the phone. He asked to borrow some more money,promising that he’d pay all of it back once he landed a job. Out of kindness,I still gave him the exact amount he needed,which was twice the amount I had given him initially. He was so grateful. It’s so hard to find someone willing to lend you that amount of money,even with interest.

Fast forward a few months later. One evening,I was feeling happy and love filled my heart. I felt like performing a special act of kindness. And then I thought,“Why not cancel my friend’s debt? Things are so difficult for him,you know? ”So I called him up and told him I had canceled his debt. He was shocked! He couldn’t believe it. He was so happy and later sent me a message of heart-felt gratitude.

Me too! And I felt grateful for his gratitude.

In life,it is the small but powerful actions of love that matter. When life is over,that’s what counts.

小题1:For what purpose did the author’s friend turn to him for help when they were in university?(no more than 10 words)

小题2:Fill in the blank in Paragraph 2 with proper words. (no more than 5 words)

小题3:According to Paragraph 4,what did the author decide to do?(no more than 10 words)

小题4:How did the author’s friend feel after he received the phone?(no more than 5 words)

小题5:What does the author intend to tell us?(no more than 10 words)

计算题