有关受体的概念正确的是（）A.是一类介导细胞信号转导的功能蛋白质 B.是首先与药物结

老年人在下述哪种情况下不适宜应用洋地黄（）

A.阵发性室上性心动过速

B.充血性心力衰竭

C.左心舒张末前后径68mm

D.房颤伴心室率快

E.房室传导阻滞

— Do you know the man ______ is talking to our headmaster?

— Yes, I do. He is our new math teacher. [ ]

A. who

B. whom

C. which

D. whose

国家治理的基础和重要支柱是（）。

A.经济 

B.财政 

C.税收 

D.科技

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. Spread spectrum simply means that data is sent in small pieces over a number of the（71） frequencies available for use at any time in the specified range. Devices using（72） spread spectrum (DSSS) communicate by （73） each byte of data into several parts and sending them concurrently on different （74） . DSSS uses a lot of the available （75）, about 22 megahertz (MHz).

71（）

A．continuous

B．high

C．low

D．discrete

在“一块”、“一本”中、“一”字分别读（）声和（）声。