Twenty-two feet long and 10 feet in diameter, the AM-1 is one of the many new satellites that is a part of 15 years effort of subjecting the interactions of Earth’s atmosphere, oceans, and land surfaces to detailed scrutiny from space.
- satellites that is a part of 15 years effort of subjecting the interactions of Earth’s atmosphere, oceans, and land surfaces
E. satellites that are part of a 15-year effort to subject the interactions of Earth’s atmosphere, ocean, and land surfaces
几个问题:
E中为何不用:satellites that are parts of...
Earth’s atmosphere, oceans, and land surfaces
A可以用强制指代来解释,而且上述两种用法都是正确的 |