Exercício: Células-Tronco - Texto em inglês

Olá Pessoal,

Preencha os espaços em branco com as preposições mais adequadas e responda as perguntas sobre o texto.

Preposições sugeridas: [at, of, about, in, without]

Despite the enormous therapeutic potential for stem cells to treat a vast array...serious diseases there are still concerns...potentially dangerous results. Scientists are excited...the possibilities...saving lives and reducing morbidity from disease but...the same time, there are fears regarding unexpected results and effects from stem cell usage. With recent technologies having triggered a major increase...stem cell treatments, the concept...stem cell therapies is no longer such a foreign one.
Both scientists and the public shouldn't, however, simply accept these technologies...first contemplating their impact on society. Although the benefits of stem cell therapies are enormous, risks must also be considered.

Questions:

A) What is the upside of stem cells?
R:...
B) What is the downside of stem cells?
R:...
C) Are the treatments completely safe?
R:...
D) What do you know about stem cell treatments?
R:...

respostas

Ordem das preposições que completam o texto: Of; about; about; of; at; in; of; without

A) Enourmous therapeutic potential to treat a vast array of serious diseases.
B) There are fears regarding unexpected results and effects.
C) Scientists still aren't sure of this.
D) They're one of the most important discoveries ever made by scientists. It's giving people new hope

Bons estudos.