A:
B:
C:
D:
下列函数中, 最小正周期为π的是( )
下列说法错误的是( )
下图是“我国人均占有耕地面积变化图”,读图,完成下列各题。
bì yù
zhuāng chéng
cái chū
____
jiǎn dāo
děng xián
wàn zǐ qiān hóng
—_________ weather it is! We can't go boating on the Xuanwu Lake.
—Don't worry. Let's go to the Science Museum instead.