Question

The U.S. has sent unmanned spacecraft to _____ the planets in our solar system. A. all B. most C. some D. none of

Answer 1

Answer:  A. all

Every planet in our solar system has been visited by an unmaned spacecraft sent by the United States. The launch years are given in this order

• Venus (1962)
• Mars (1964)
• Mercury (1973)
• Jupiter (1977)
• Saturn (1977)
• Uranus (1977)
• Neptune (1977)
• Pluto (2006)

Answer 2

Answer:c some

Explanation:

only a couple of planets have had unmanned spacecraft sent to them