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1. Not woman held a presidential cabinet position in the United States until 1933, when Frances Pekins became secretary of labor.(1)____
译文：直到1933年Frances Perkins成为劳工部部长，美国才有女性任职于总统内阁。
2. Too much electric current may flow into a circuit as a result either of a fault in the circuit and of an outside event such as lightning.(2)____
译文：电路故障或者诸如闪电等外部事件会导致进入电路的电流过大。
3. Barges which carrier most of the heavy freight on rivers and canals are usually propelled by towing.(3)____
译文：在水道和运河上承载大多数重货的驳船通常是靠拖力来驱动的。
4. It is more difficult to write simply, directly; and effective than to employ flowery but vague expressions that only obscure one's meaning.(4)____
译文：相比采用辞藻华丽、但晦涩难懂的模糊表达而言，简单、直接和有效的写作更为困难。
