— Jack, ______ play the violin here. We're talking now.
— Sorry, Ms. Clark.
A:doesn't
B:not
C:don't
D:no
①能发生加成反应;
②能溶解于NaOH溶液中;
③能水解生成两种有机物;
④不能使溴水褪色;
⑤能发生酯化反应;
⑥有酸性.
如图,已知抛物线y=﹣x2+bx+c与x轴交于A(﹣1,0)、B(3,0)两点,与y轴交于点C,抛物线的对称轴与抛物线交于点P、与直线BC相交于点M,连接PB.