蒽醌及其苷类多为（）或（）色的结晶，有一定的熔点，游离蒽醌类具有（）（）性。
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商业银行接受商品房作为贷款抵押物的其房屋空置时间不得超过（）
A. 1年
B. 3年
C. 2年
D. 4年
“修”，严格说来是一个形声字，其中三撇的部分是指它的含义、跟发须有关。
A. 正确
B. 错误
Where does the look-out man stand?（）.
A. In positions in which the noises in the ship are least likely to interfere with the hearing of a fog signal and the man can see clearly
B. In positions in which the noises in the ship are much likely to interfere with the hearing of a fog signal
C. In positions in which the hearing of a signal is reduced to a minimum
D. In a position in which the man can see clearly
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