问题如下：
A current account deficit is least likely caused by which of the following items ?
选项：
A. High private investment.
B. High private savings.
C. Low taxes.
解释：
B is correct
The reasons lead to a current account deficit include low private saving, high private investment, a government deficit, or a combination of the three. Above all the choices, only high private savings is least likely to contribute toward a current account deficit.
考点：Trade Balance.
解析：X-M=(S-I)-(G-T)
通过上述公式可以得知，较高的 private investment，较低的 private savings 以及较低的 taxes都会引起X-M的降低（ Crrent account deficit ）。
这题怎么看出是在问赤字减少