正在行驶的列车速度是15m/s，这句话的物理意义是______．

阅读理解。

     An English dictionary is the most important thing when you learn English. Successful English learners

always use their dictionaries in order to learn new words. In this way, they will know how to use a word

after reading its English examples. By doing so, they can think in English. A dictionary plays an important

part in both your English speaking and your English writing. Recently, e-dictionaries have become more and

more popular. There are many advantages in using them. For example, they are easy to carry and quick to use.

Also, there are a large number of words with real-voice pronunciation. Whenever you want to know a new

word, take an e-dictionary out of your pocket, and then you'll find a satisfying answer.

1. 根据英文释义及首字母提示，拼写单词。

(1). n _______ a word that shows how many

(2). p _______ liked by many people

2. 同义句转换，每空一词。 

    Successful English learners always use their dictionaries in order to learn new words. Successful

English learners always use their dictionaries  _______  _______ they can learn new words.

3. What is the most important thing when you learn English?

    _______________________________________________________

导致代谢性猝死的原因（）

A.张力性气胸

B.心室颤动

C.脑出血

D.暴发性重症胰腺炎

E.高血钾

按照污染物排放的形式，污染物可分为( )。

A．点源

B．高架源

C．地面源

D．面源

E．线源

厂、段修ST型缓冲器时，只要发现箱体口部有裂纹就必须更换。

《素问·太阴阳明论》认为“伤于风者”（）

A.下先受之

B.上先受之

C.脏先受之

D.腑先受之

E.表先受之