单选题
Venus (金星) is our nearest neighbor (
Example:{{U}} 0 {{/U}}) space and it is {{U}} {{U}} 1
{{/U}} {{/U}}42 million kilometers {{U}} {{U}} 2 {{/U}}
{{/U}}. We know that in some ways Venus is {{U}} {{U}} 3 {{/U}}
{{/U}}the earth. It is like the earth to go {{U}} {{U}} 4 {{/U}}
{{/U}}the sun. It is almost as big {{U}} {{U}} 5 {{/U}} {{/U}}the
earth, too. Earth people can't live {{U}} {{U}} 6
{{/U}} {{/U}}air but our neighbor doesn't have this kind of air. There is very
{{U}} {{U}} 7 {{/U}} {{/U}}water on Venus. Some scientists
believe there may {{U}} {{U}} 8 {{/U}} {{/U}}lives on it. These
scientists think that some microbes (微生物) may be able {{U}} {{U}}
9 {{/U}} {{/U}}live on Venus. They are not sure {{U}} {{U}}
10 {{/U}} {{/U}}this but one thing -- earth people could not live on
Venus.