—— ________ we go swimming in Xishuanghu Lake today?—— Oh, no. It's ________ cold to swim on such days. I will catch a cold.
A:Will; very
B:Will; too
C:Shall; very
D:Shall; too
①模拟实验 ②化石研究 ③进行比较 ④科学推测.
说一说,下面的哪些图形是对称的?( )