21. Color shapes our view of _______ world and it may have _______ far more influence on our lives than many of us realize.
A. /; a B. the; / C. the; the D. the; a
22. Always read the ________ on the bottle carefully and take the right amount of medicine.
A. explanations B. instructions C. Descriptions D. introductions
23. Generally speaking, the speaker would make a(n) self-introduction before beginning his topic.
A．actual B．accurate C．brief D．original
