题目

Compared with his sister, Jerry is even more ____   to, and more easily troubled by , emotional and relationship problems. A. sceptical           B. addicted          C. available        D. sensitive 答案：D 解析: be sensitive to对什么敏感。Jerry is even more sensitive to emotional and relationship problems. more sensitive to与more easily troubled by 并列。如图所示，在试管内盛有稀硫酸，试管口用食品袋扎紧[不漏气]，袋内放有固体，此时天平保持平衡．若将固体放入试管内，最终出现左盘升右盘降现象，此时加入的固体是（　　） A、MgOB、MgC、CuD、Na2CO3