Which of the following sexually transmitted infections usually presents no symptoms to women in its early stage?

The lights along the runway were shrouded in such a thick fog that the pilot of an incoming plane nearly overshot the runway. The pilot was most likely misled by the distance cue known as:

a. lightness constancy. b. convergence. c. linear perspective. d. relative clarity.

According to C. P. Snow, "more hideous crimes have been committed in the name of ________ than in the name of rebellion."

a. obedience b. conformity c. religion d. the law