As a proverb goes, “The eyes are the window of the soul.” Eye protection is animportant issue, for once our vision __36__, it will be lost forever. People today, however,are plagued more by imperfect vision—suffering from near-sightedness, far-sightedness,presbyopia, cataracts, etc.—than by the complete loss of their vision. The __37__treatments are prescription glasses and contact lenses, but their disadvantages are obvious:glasses look awkward and are troublesome to handle, while contact lenses are likely tocause discomfort and even eye infections. Luckily, a new treatment—laser surgery —hasarrived just in time to save the day. Using special __38__ and advanced technology,doctors operate on the eyes of patients with lasers. The process is fast, safe, and almostpainless. The time needed for the eyes to heal is short, too. __39__ it still involves somerisks, more than a million people have benefited from this cutting-edge medical procedure,and __40__ is still growing.
【題組】36.
(A) is lost
(B) was lost
(C) is losing
(D) will be lost