读“地球自转示意图”，图中阴影表示黑夜，完成下列各题：（每空1分，共10分）

（1）在地轴北端标出地球自转方向。

（2）若在A点的上空观察，则地球自转的方向是    时针。

（3）A、B、C、D四点中线速度和角速度均为0的是    点，角速度相等的是       点，线速度最大的是      。  

（4）图中B点在     线上（晨或昏），比较A、B、C、D四点的地方时大小为    最早，    最晚，      和     是相同的。

Suppose a price-taker firm produces baseball bats that sell at a price of $100 each. This firm’s average total cost at the current level of production is $150 per bat, and the average fixed cost is $40 per bat. Which of the following statements is TRUE regarding this firm They should:（）

A. shut down in the short run because their average total cost is greater than their price.

B. continue producing baseball bats because they are covering their fixed costs.

C. shut down in the short run because their average variable cost is greater than their price.