A:∀x∈R,x2﹣x﹣1≤0
B:∀x∈R,x2﹣x﹣1>0
C:∃x0∈R, x02−x0−1≤0
D:∃x0∈R, x02−x0−1≥0
I have a good friend. His/ Her name is…….
She\He is……years old.
She\He has…… (clothes)
She/ He can…….
读图,回答下题。