现有下列物质：①铁 ②清新的空气 ③液氧 ④锰酸钾 ⑤糖水 ⑥硫燃烧后的生成物

既作为淋巴细胞归巢受体，又与肿瘤转移有关的是（）

A.CD2

B.CD3

C.CD16

D.CD32

E.CD44

胼胝体发育不良的发生年龄（）

A.胚胎第4周

B.胚胎第8周

C.生后2周

D.2岁

E.6岁

短文改错（每小题1分，满分10分）

Last night, I have a strange but interesting dream. On the way back home. I came across child from another planet. His clothes seemed to be shining and looked beautifully. As I got close to him, he looked frightening and turned his back to me. Though I couldn’t speak his language, I used hand gestures to talk about him. A while later, he told me lots of amazing thing on his planet, which made me laughing, but suddenly, he began to cry, and then he explained he had lost his way but couldn’t find his home. Seeing that, I was offered to help him. His home had a telephone number like ours, so I asked him to call his parents using my phone. Soon before making the call he disappeared.

读材料和图，结合所学知识回答下列问题。

材料一：目前，广东已进入工业化中后期阶段，珠三角发展受到了土地、资源、劳动力价格、环境四方面约束，加上受国际金融危机和人民币升值影响，持续发展 “难以为继”。广东省政府投500亿巨资，实施2008~2012年产业、劳动力双转移战略，实现劳动密集型、附加值低的低端制造业的区域转移。同时，将粤东、粤西和粤北等地农村劳动力600万人转移进入工业和服务业，使这些地区非农就业比重将由目前的71%提高到80%以上。

材料二：右图是产品不同生产环节与所实现的附加价值关系图

（1）根据材料一，说出广东省产业转移的特点及方向，并分析产业进入地区的有利条件。

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（2）在工业生产和产品销售各环节中，_________________环节利润最低，跨国公司总部最优先掌握的环节是_____________和______________。

（3）珠三角是世界著名的制造业发达地区。随着产业、劳动力双转移战略的买施，一些专家提出了由“珠三角制造”转为“珠三角创造”的发展战略，请结合材料二，说明其转变的原因。

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变频器控制方式大体可分为两种：（）和（）。