What does the man want to buy for his
daughter?
A:A dictionary.
B:A mobile phone.
C:A toy bear.
计算x2•x3的结果为____
读《渔家傲·秋思》,千嶂____:____的山峰;崇山峻岭。
若sinπ3-α=14,则cosπ3+2α=( )