煤的发热量的高低是主要由（）元素成分决定的。

阅读下面四篇短文，根据文章的内容选择最佳答案作答1-4小题。

     It was late at night when Sam got off the train. He was tired and wanted to find a hotel to have a rest.

He looked around and saw a hotel not far away. There were three floors in it. Then Sam went in.

     "How much do I need to pay for a single(单人)room a night?" Sam asked. "Well, sir" said the girl, "a

single room on the first floor is 50 dollars a night."

     "What about the one on the second floor?" asked Sam. "40 dollars."

     "Then how about the one on the third floor?" "30 dollars."

     Sam picked up his bag and wanted to go out. "Don't you think our price is reasonable?" the girl

asked. "Yes," said Sam. "Your price is of course reasonable, but I'm sure your hotel is not high enough."

1.Sam wanted to find a hotel after ______.

A. having a good rest

B. walking a whole day

C. getting off the train

2. Sam needed to pay ______ for a single room on the third floor

A. $ 30

B. $ 40

C. $ 50

3. The underlined word "reasonable" means ______.

A. sound(合理的)

B. high

C. low

4. Sam didn't stay in the hotel because ________.

A. the hotel wasn't clean

B. the hotel was full(满的)

C. the price was high

-There is ______ milk in the fridge. Please buy some on your way home.

-All right. [ ]

A. much

B. many

C. little

D. few

支原体肺炎首选()
社区获得性肺炎链球菌肺炎首选()
常与β-内酰胺类抗生素合用，对静止期细菌有杀菌作用()
与茶碱合用，可升高氨茶碱的血药浓度()

A．大环内酯类

B．喹诺酮类抗菌药

C．头孢菌素类

D．青霉素

E．氨基糖苷类

医德评价的标准不包含（）。

A.有利

B.自主

C.公正

D.互助

E.奉献

中药为什么要炮制举例说明之。