What is the finding of Howard Friedman's research? ( )

(单选题)以下表述正确的是（    ）。 (单选题)恩格尔曲线表示消费者在每一（    ）水平对某商品的需求量。 (单选题)消费者的预算线反映了（    ）。 (单选题)当一个国家有贸易赤字时，以下表述正确的是（    ）。 (单选题)在宏观经济学理论中，由于经济萧条引起的失业属于（    ）。 (单选题)What is the author’s suggestion over the debate on Brexit de (单选题)What is Plan B according to the last paragraph? (    ) (单选题)What does the polls suggest? (    ) (单选题)Which one of the following statements is TRUE, according to (单选题)What the “deal” mainly refers to in paragraph 1? ( ).