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问题
判断题
通常把跨度小于35m、起重量不大于40t的门式起重机称为装卸桥。
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填空题
某种感冒病毒的直径为0.0000000031米，用科学记数法表示为______米．
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选择题
— Did you telephone Uncle Sam our plan for the Christmas holidays on his farm?
— Yes, he was happy about our arrival, and he eagerly asked when _____.
A. had we arrived
B. we had arrived
C. were we arriving
D. we were arriving
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