【单选题】Everyone 【21】______ of the President of the US 【22】______ the most powerful man in 【23】______ But when the representatives of the 13 former British colonies 【24】______ to draw up the constitution of t...
【简答题】To us it seems so natural to put up an umbrella to keep the water off when it rains.But actually the umbrella was not invented as protection.against the rain,It was first used as a shade against the s...