1．(2019·常熟中学调研)While mobile phones are thought to double the risk of developing brain cancer, many businesses have made claims________the safety of their products.
A．in need of B．in defense of
C．in search of D．in view of
B 解析：句意：尽管手机被认为使患脑癌的风险翻番，许多企业已经发表声明来保护他们产品的安全性。in need of需要； in defense of保护； in search of寻找； in view of考虑到。
2．Knowledge and learning are important if we want to be successful, but they may also ________ our thinking.
A．direct B．limit
C．change D．improve
B 解析：考查动词词义辨析。句意：如果我们要想成功，知识和学问是重要的，但是它们可能也限制了我们的思维。direct指引，指导； limit限制； change改变； improve提高。根据句意可知选B。
3．(天津卷)You are working too hard.You’d better keep a ________ between work and relaxation.
A．promise B．lead
C．balance D．diary
C 解析：考查名词辨析。句意：你工作太努力了。你最好在工作和放松之间保持平衡。promise诺言； lead领先； balance平衡； diary日记。keep a balance为固定短语， 意为“保持平衡”， 符合句意， 故选C。
