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.
【C1】

选项 A、no more than
B、as much as
C、by the time
D、so far as

答案 C

解析 空白处引导的从句表示开始脱发的时间。no more than:只有(常接数字); as much as:多达(接数字);so far as:到……程度(相当于to the extent or point that….),如so far as I know(据我所知);by the time:到……时候。该结构或by the end of…表示“事情发展的阶段”,不是必须使用完成时,表示进行的动作可用进行时,而表示状态可用一般时。在我国,学生见到by the time就想到完成时,这实际上是错误的认识。
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