According to the text, judge the following items.
Researchers were paying $ 600 so that they could be subjects in the testing of the vaccine.
According to the text, judge the following items.
Having their blood drawn twice and drinking the actual vaccine were two of the conditions to which participants had to agree.
According to the text, judge the following items.
Another blood draw would be mandatory if the participant came down with the flu.
De acordo com o texto, os oficiais de polícia em início de carreira usualmente 
Ao longo da carreira, o oficial de polícia 
Among the many tasks, mentioned in the third paragraph, a police officer may perform in the line of duty, is to “secure evidence”. The phrase means, in Portuguese, the same as 
Na expressão “sexual assault”, que ocorre no quarto parágrafo, a palavra “assault” tem, em português, sentido semelhante a 
No trecho do último parágrafo – Police officers must be available for shift work at any time of day and any day of the week, including holidays. –, a palavra em destaque transmite a ideia de 
In the last sentence from the text – Even though many regular police duties are routine in nature… – the phrase in bold expresses a relationship of 
Based on the text above, judge the following items.
In the sentence “they are tracked” (l.20), the pronoun “they” refers to “someone” (l.19).