“放射性”概念的提出者是
A. 伦琴
B. 居里夫人
C. 诺贝尔
D. 门捷列夫
In the video ,we can hear My stomach is rumbling.Which word has the similar meaning?( )
A. ache
B. hungry
C. uncomfortable
D. grumble
What does “I have a tight schedule today.”mean?( )
A. I am free today.
B. I am pretty busy today.
C. I have to work today.
D. I have to go to school today.
What’s the difference between hamburger and sandwich?( )
A. The taste
B. the meat
C. The shape
D. The flour
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