A:to take
B:taking
C:took
D:take
Mrs. Lin said she ____ (she) would design the uniform of the team.
等差数列{an}中,a3=2,a5=7,则a7=( )
某品牌厨房清洁剂,经测定其pH约为13。对该清洁剂的酸碱性判断正确的是()