Which is NOT a possible cause of mental retardation？
Alcohol or drug abuse.
B. Abnormal genes from the parents.
C. a well-planned pregnancy.
D. Problems during childbirth.
Which statement is NOT true of Covent Garden？
A. It is crowded with people.
B. It is located in London.
C. It is filled with stalls.
D. It is surrounded by shops, churches, restaurants and cafés.
某工作第4周之后的计划进度与实际进度如图2所示，从图中可获得的正确信息有 ()。
A. 到第4周末实际进度超前
B. 在第6周内实际进度与计划进度不一致
C. 原计划第4周至第6周为匀速进度
D. 本工作将拖后1周完成
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