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Which of the following statements is NOT true??

• A、Primitive people had to ann themselves with wooden sticks when they travelled．
  

• B、.Primitive people protected themselves with stone clubs when they travelled．
  

• C、Primitive people had to travel in groups．

• D、Primitive people never traveled at night．

 你是Lucy，写一封给老同学Allen的邀请信，邀请他参加下个星期日下午4点(12月23日)的校友聚会。希望Allen尽快回信接受邀请，以便他们及时做好安排。

What’s the reason for twins to be at a disadvantage in their intellectual development?

• A、They can only understand their own private language．

• B、They communicate with outsiders less than non-twins．

• C、There is little stimulation for them．
  

• D、Adults don’t like to talk with them．