Bob was a gardener and he had no work for a few months. One day he went out to look for a job. While he was walking in the street, he saw a poster at the gate of a big restaurant. It said the restaurant needed to hire（雇佣） a man who could grow flowers and trees well. Bob was so pleased that he went straight to answer it. There Bob was told to go back and get his old working clothes to the office. Bob did so.

The boss looked over his working clothes carefully and then decided to let Bob have the job. Bob asked the boss why his working clothes were so important. The boss answered with a smile, "Oh, young man, your working clothes are all with patches(补丁) on the knees. You know, I have dismissed（解雇） two men these days. They had working clothes with patches on the buttocks(臀部). They were too lazy."

小题1:When the boss saw Bob, he ________.

A．gave him the job at once

B．liked Bob at once

C．asked Bob to go home to get his working clothes

D．liked Bob's clothes小题2:Bob's new job was________.

A．to wash dishes

B．to clean the restaurant

C．to cook dishes

D．to grow flowers and trees小题3:We may learn that the boss was ________.

A．very clever

B．foolish

C．very kind

D．hardworking

低镁血症对机体的影响有哪项是不正确的？（）

A.神经肌肉的应激性增强

B.可引起多种神经、精神症状

C.可引起心律失常

D.可拮抗儿茶酚胺和内皮素等的缩血管作用