Which of the following is NOT true about the Philippines？
A. Friends greet each other with a polite nod or a handshake．
B. An old man blesses a child by putting his right hand on the child's forehead．
C. It's impolite to touch the back of the hand when shaking hands．
D. In the Philippines,family members can greet each other with a kiss．
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The Maoris usually_______ when they meet each other．
A. kiss each other on cheeks
B. press their nose
C. pat on the back
D. bow to each other
People all around the world are changing their way of greetings to reduce the risk of contacting corona virusand prevent it from spreading except _______________.
A. hug each other
B. footshaking
C. elbow bump
D. kiss each other
MATLAB变量命名规则中，变量名必须以（）开头。
A. 数字
B. 字母
C. 下划线
D. 特殊符号
下列MATLAB命令中，表示一次创建多个符号变量是哪个选项？
A. sym a
B. syms a b x y
C. sym(‘x’)
D. sym(‘x y z’)
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