18．A.them

　　B．themselves

　　C．us

　　D．ourselves

　　解析：选B。因为此处是说children，故用反身代词themselves，表示“让孩子们做他们自己”。

　　19．A.from

　　B．by

　　C．with

　　D．against

　　解析：选B。by one’s side through thick and thin是固定表达，意为“在某人的身边与某人同甘共苦”。

　　20．A.still

　　B．otherwise

　　C．then

　　D．instead

　　解析：选C。“社会建立在这种友谊之上，那么我们才能真正成为……”。A项still为“仍然”；B项otherwise为“否则的话”；C项then为“那么”；D项instead为“相反地”。

　　Ⅲ.阅读理解

　　China’s first female astronaut Liu Yang，together with her two male crewmates Jing Haipeng and Liu Wang，met the media on Friday.The three astronauts would board the Shenzhou IX spacecraft on Saturday at the Jiuquan Satellite Launch Center in northwestern China to fulfill China’s first manned space docking mission.

　　“I am grateful to the motherland and the people.I feel honored to fly into the space on behalf of hundreds of millions of female Chinese citizens，” said Liu Yang.She said that to be an astronaut，one has to obtain a lot of theoretical knowledge，go through very challenging space living environment training and survive examinations on operation skills with no error.

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