【名词&注释】
多边形(polygon)、美国人(americans)、星期五(friday)
[单选题]生活中常接触到“含氟牙膏”，“高钙牛奶”，“碘盐”，“富硒茶叶”和“加铁酱油”等用品，这里的氟，钙，碘，硒和铁指的是（ ）
A. 单质
原子
离子
元素
查看答案&解析
举一反三：
[单选题]BBruce :Mum， this is my friend， Frank．
C. That's my broth
E. Frank :And is this your sister?
G. Bruce and Peter are____．
H. brothers
I. sisters
J. cousins
K. cousin
[单选题]7． I _________ my father，not my mother．
A. take after
B. similar to
C. the same as
D. am after
[单选题]22． Which is similar to the sentence "It's true that most Americans take fast food as their breakfast and lunch"?
A. Most Americans don’t eat fast food for their breakfast or lunch．
B. Most Americans have fast food for their breakfast and lunch．
C. Most Americans like to eat fast food for dinner．
[单选题]50．—could you take care of our dog while we are away?—__________
A. With pleasure
B. It's my pleasure
C. Never mind
D. That's all right
[单选题]22． Zhao Hai and his brother go to school _______days a week．
A. six
B. five
C. seven
D. four
[单选题]25． We can find ________under Lily's bed．
A. a backpack
B. some flowers
C. a basketball
D. a baseball
[单选题]下面各角能成为某多边形的内角和的是（ ）
A. 430°-
B. 4343°-
C. 4320° -
D. 4360°
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