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850张三今年50岁，妻子李四44岁，二人均不得从事高处作业。()

A. 对
B. 错

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851如果梯子要接长使用,必须对连接处进行认真检查,强度不能低于原梯子的强度,且不能有接头。( )

A. 对
B. 错

‌How many judges are there in the American Supreme Court?

A. 8
B. 6
C. 9
D. 7

There are currently ___ district courts in the US.

A. 52
B. 54
C. 92
D. 94

There are currently ___ Courts of Appeals in the US.

A. 10
B. 11
C. 12
D. 13