53（）

单项选择题47（）

A.The local police were searching for him. 　　
B.Smith is a 26-year-old single mother with a daughter. 　　
C.Smith tried very hard to kill Nichols. 　　
D.She even cooked breakfast for the man before he allowed her to leave. 　　
E.And the two of them discussed this topic. 　　
F.Then she called the police.

单项选择题The person who had tested healthy before the study （）

A．dropped out.
B．passed away.
C．was found to have cancer.
D．was found to remain healthy.