Earlier this year， China achieved a new milestone（里程碑） in space exploration（探索）． On Jan 3， Chang'e 4 became the first space probe（探测器） in history to land on the far side of the moon， People's Daily reported．
From Earth， we can only see one side of the moon． The other side has been a mystery． Scientists have long wondered what lies on this side of the moon．
Chang'e 4 has sent back photos of the far side of the moon． It is also used to carry out experiments， such as growing seeds in a low﹣gravity（低重力） environment． The data（数据） collected from these experiments could be used to help us build a base on the moon in the future．
The success of the Chang'e 4 mission（任务） is a main achievement for China's space program． Itmarks a new stage in China's deep space exploration， said Wu Yanhua， head of China National Space Administration．
China launched（启动） its lunar（月球的） exploration program in 2004， naming it Chang'e． Chinese scientists set three goals ﹣"orbiting（环绕运行）， landing and sample（样本） returning"﹣ referring to launching probes that could circle around the moon， touch down on its surface and bring lunar materials back to Earth．
Chang'e 4 has realized the goal of landing． The third will be achieved during the Chang'e 5 mission， which is set to take place before the end of this year， China Daily reported．
Following the success of the Chang'e missions， Chinese scientists are looking even farther into our solar system（太阳系）． China's first Mars（火星） mission is expected to be carried out by 2020， Wu said．
（1）What is the data collected from these experiments used to do？
| A． |
Help us build a base on the earth．
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| B． |
Help us build a base on the moon．
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| C． |
Help us build a base on Mars．
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| D． |
Help us build a base on Venus（金星）．
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（2）What has Chang'e 4 done so far？
a．It has landed on the far side of the moon．
b．It has taken photos of the far side of the moon．
c．It has carried out experiments on the moon．
d．It has built a base on the moon．
| A． |
abc
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| B． |
bcd
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| C． |
acd
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| D． |
abd
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（3）What does the underlined word " It" refer to in Paragraph 4？
| A． |
A base on the moon in the future．
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| B． |
The Chang'e 4 probe．
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| C． |
The success of the Chang'e 4 mission．
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| D． |
China's space program．
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（4）What is Chang'e 5 expected to do？
| A． |
Circle around the moon．
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| B． |
Land on the surface of the moon．
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| C． |
Bring lunar materials back to Earth．
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| D． |
Send people to the moon．
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（5）What can we infer（推断） from the passage？
| A． |
Chang'e 4 has discovered the secrets of the far side of the moon．
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| B． |
China's space exploration program started 15 years ago．
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| C． |
Chang'e 5 will be China's last lunar exploration program．
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| D． |
China has not launched any space probes to Mars so far．
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