【名词&注释】
物主代词(possessive pronouns)
[单选题]把一个质量是0.5kg的篮球竖直向上抛出,假定运动过程中空气对它的阻力恒为0.5N,则篮球在竖直上升和降落过程中所受力的合力分别是: ( )。
A. 5.5N 5N
B. 5.5N 4.5N
C. 4.5N 5.5N
D. 5N 4.5N
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学习资料:
[单选题]( )Some students prefer yellow rulers or erasers when they study for exams because yellow is the color of __________.
A. wisdom
B. purity
C. nature
D. peace
[单选题]15.
A. My
B. Your
C. His
D. Her
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