D．always think in their children's shoes

　　5．What does the underlined word "them" in the last paragraph refer to A．children

　　B．bad behaviors

　　C．parents．smartphones

　　—5、CADCD

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　In the long discussion of water on the Moon, a new study contradicts (与……相矛盾) some recent reports that say the Moon had water at the time of its formation. A group of researchers reports in the journal Science that when the Moon was created, some 4. 5 billion years ago, there was not much hydrogen (氢气) on it, and therefore no water.

　　The researchers surveyed and evaluated this by analyzing chlorine isotopes found in lunar rock samples from Apollo missions. The range of chlorine (氯) isotopes in lunar samples was 25 times that found in samples from Earth.

　　“If the Moon had significant levels of hydrogen, as Earth did, this range would have been far less,” said Zachary D. Sharp, a scientist in the Department of Earth and Planetary Sciences and the study’s lead author.

　　“The chlorine would have stuck together with hydrogen, forming compounds like hydrogen chloride, and escaped from the Moon’s surface,”he said. The abundance of chlorine indicates a lack of hydrogen and water.

　　“The amount of water on the Moon was way too low for life to have ever have possibly have existed there,” he said.

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