The word "impairment" ( Line 2, Para. 1 ) probably means _______.
[A] habit [C] misconception
[B] disability [D] belief

单项选择题According to Professor Healey, we may infer that mentally retarded children perhaps _______.

单项选择题Which of the following sentences is TRUE[A] All apes are brown or black, [C] Apes have weak legs but very strong arms.[B] All parts of apes' bodies are covered with hair. [D] Apes' arms are strong enough to swim.