A:应在黑暗条件下测定浮游绿藻的有氧呼吸强度
B:双氯芬酸能对浮游绿藻线粒体的功能产生影响
C:双氯芬酸污染会使浮游绿藻吸收无机盐能力下降
D:双氯芬酸不会对浮游绿藻的无氧呼吸产生影响
It is said that pandas ______ in our country year by year.