问题 不定项选择题

膦(PH3)又称磷化氢,在常温下是一种无色、有大蒜臭味的有毒气体,电石气的杂质中常含有磷化氢。它的分子构型是三角锥形。则下列关于PH3的叙述正确的是 [ ]

A.PH3分子中有未成键的孤对电子

B.PH3是空间对称结构

C.PH3是一种强氧化剂

D.PH3分子中的P-H键间夹角是90°

答案

答案:A

阅读理解

阅读理解

     A: I once heard someone shout, "Look out." I put my heard out of the window and a bucketful water

fell on me. It seems that "Look out" may mean "Don't look out".

     B: I was once on a ship and heard the captain shout, "All hands on deck(甲板)." I put my hands on

the deck and someone walked on them.

      C: I once called early on an English friend and the servant who came to the door said, "He's not up

yet. Come back in half an hour." When I went again for him, she said, "He's not down yet." I said, "If

he'sneither up nor down. Where is he?" 

1.  In the dialogue the phrase "Look out" actually means "______".

A. Don't look out              

B. Look out for the water

C. Be careful                  

D. Look everywhere

2. The underlined word "them" in the dialogue means _______.

A. my feet      

B. my hands    

C. the ship      

D. the deck

3. "He is not up" and "He is not down" in the dialogue actually means _______.

A. He doesn't stand up and doesn't lie down

B. He doesn't come up and doesn't go down

C. He hasn't turned up and hasn't turned down

D. He hasn't got up and he hasn't come downstairs

4. The best title for the dialogue may be _______.

A. Look Out

B. All Hands On Deck  

C. How Strange

D. What A Language

5. The writer writes the dialogue to tell us that ______.

A. English is very interesting if you like it and keep on using it

B. it is impossible to learn English very well in a short time

C. languages keeps on developing and changing all the time

D. words and phrases may have different meanings in different situations.

问答题 简答题