Hair loss, or getting bald, is quite common. Nearly two out of every three men will begin balding【C1】______ they’re 60. Most don

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问题     Hair loss, or getting bald, is quite common. Nearly two out of every three men will begin balding【C1】______ they’re 60. Most don’t part with their hair willingly—American males collectively spend $1 billion a year trying to【C2】______ their hair. And with good reason, recent research suggests that women find balding men less attractive than their【C3】______ who have a thick head of hair, and they may also be【C4】______ for executive positions in their careers. But what really causes hair loss, and is there anything that can be done【C5】______ it? This natural breakthrough for hair loss may be the answer.
    Recent research suggests that the most【C6】______ type of hair loss, male pattern baldness, can be【C7】______ by faulty hair-making cells in the skin of the head. Researchers have long believed that men whose hair【C8】______ thins— starting with a receding hairline, and then stretching to the crown—lacked a sufficient number of these cells. 【C9】______, it appears that the cells are merely unable to complete their normal development and mature to a fully-functioning state. That finding could be the key to reversing hair thinning and baldness【C10】______  the universal belief that there is no effective cure for hair loss.
【C8】

选项 A、defensively
B、retrospectively
C、respectively
D、progressively

答案D

解析 defensively:防御性地;retrospectively:回顾性地;respectively:各自地,分别;progressively:逐渐地,逐步地。空白处后面说明脱发的过程:额头上方的发际线逐渐后撤,无发的区域慢慢地延伸到头顶。
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