第1题: [单项选择]Only later ______ his notebooks, which contained details of all his thefts. A. they came across B. did they come across C. they had come across D. had they come across 参考答案:B 答案解析:[解析] 本题考查倒装结构。本题中含有only的时间状语提前，因此句子的主语和谓语要部分倒装；又因为根据句意可以判断come across是发生在过去的动作，所以动词用一般过去时，故B项为正确答案。
第6题: [单项选择]人胚自妊娠第8周到12周的胚胎期 A. 对化学物经胎盘致畸的敏感性降低 B. 对化学物经胎盘致癌的敏感性增高 C. 对致畸的敏感性最高 D. 器官系统可出现形态学改变 E. 此时受有害因素影响可致遗传病 参考答案:C 答案解析:在妊娠的最初3个月为器官形成期，这一阶段胚胎对致畸物最敏感。
A. not of the same sorts as shown in England now B. of the same kinds as shown in France now C. of the same sorts as shown in America now D. so as to the same kinds as shown in Canada before 参考答案:A
