第9题: [单项选择]Although the model looks good on the surface, it will not bear close ______. A. scrutiny B. temperament C. symmetry D. contamination 参考答案:A 答案解析:scrutiny细看、仔细研究;temperament气质,性情;symmetry对称(性);contamination弄脏,污染。句意:虽然模型表面看起来很好,但是经不起仔细研究。
第17题: [单项选择]According to the passage, what causes potassium and water in the mimosa to shift from some cells to others A. Signals from the pulvini. B. Movements of the leaf stalks. C. Electrical impulses. D. Nerve signals. 参考答案:C 答案解析:[注释] 第二段第四句This causes potassium...中的This指的正是上句中的electrical impulses。