单项选择题
The noise was so faint that you had to（）your ears to hear it.
A.stir B.strengthen C.strain D.stride
单项选择题 The manufacturers refused to take all（）for damage caused by misuse.
单项选择题 If you（）bright sunlight（）dry wood with a glass, it will start burning.
单项选择题 When he was a young boy, a serious disease deprived him of the（）of hearing.
