As we know, physics ______ the science of energy

As we know, physics ______ the science of energy

1. As we know, physics ______ the science of energy.

A.was          

B.were         

C.is           

D.are          

.标准答案：C

2. I__________my wallet when I was shopping in the store.

A.must have dropped          

B.should have dropped       
 
C.could drop                 

D.ought to have dropped      

.标准答案：A

3. A house with a dangerous gas ________ can be broken into immediately.

A.split        

B.leak         

C.mess         

D.crack        

.标准答案：B

4. The politician says he will ________ the welfare of the people.

A.prey on      

B.take on      

C.get at       

D.see to       

.标准答案：D

5 They took ___ measures to prevent poisonous gases from escaping.

A.fruitful     

B.beneficial   

C.valid        

D.effective    

.标准答案：D