Directions:In this section of the test,there are ten paragraphs.Each of the paragraphs is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph.Spell out the missing letters of the word on your Answer Sheet.
Paragraph Six
Bending and staring down at our phones for several hours increases the stress on our neck and spine,leading to neck and back pain.Experts refer to this condition as text neck and it can eventually lead to serious consequences.Also at night when we stare at our smartphones,the light emitted from their screens makes our brain think that it is still daytime.
41.Excessive use of smartphones may bring health p______.
【正确答案】：problems
