1 . 听下面一段独白，回答以下小题。1.
2.
3.
| A．The plants barely grew without radiation. | B．The plants didn’t grow fast enough. |
| C．The plants looked much stronger. | D．Not all the seeds grew in lunar dirt. |
| A．Because the astronauts didn’t take care of the dirt. |
| B．Because the dirt was exposed to radiation and solar wind for too long. |
| C．Because the dirt stressed the plants the most. |
| D．Because the Apollo 11 mission was unsuccessful. |
| A．Because they felt it meaningless to keep the dirt for long. |
| B．Because they wanted more researchers to do experiments on it. |
| C．Because they are preparing to send astronauts to the moon again. |
| D．Because they want astronauts to know more about the moon dirt. |
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