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【判断题】
用万分之一分析天平称量的数据应保留4位有效数字。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Snow soon __________ on the road, and the traffic was slowing down.
A.
accumulated
B.
built
【单选题】This morning I ___ on time. But unfortunately, there was a car accident and the traffic was blocked for half an hour.
A.
was to come
B.
must have come
C.
had come
D.
was to have come
【简答题】and the traffic was really ___________ during that time.
【单选题】There ______ so many tourists and the traffic was really busy during that time.
A.
is
B.
are
C.
was
D.
were
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