单项选择题
Our visual perception depends on the reception of energy reflecting or radiating from（）which we wish to perceive.
A. it B. these C. that D. those
单项选择题 Don't rest on your laurels;（）your success and start looking for new markets now.
单项选择题 He（）that he has discovered a new planet.
单项选择题 She （）the high unemployment figures as evidence of the failure of the government policy
