问题
选择题
We know that the Black Sea, one thousand years ago, was a fresh water lake about ________ and unconnected with the Mediterranean.
A．its two thirds present size
B．two-thirds size of the present
C．its two-thirds of the present size
D．two- thirds its present size
答案
答案：D
考查倍数和分数的表达问题。“某物以前的大小/长度/宽度/深度是现在的几倍/几分之几”的表达法：基数词+times/分数 its present size/length/width/depth”，注意，这个结构是没有of的。选D。
2Z(g) ΔH>0