西瓜之所以甘甜可口, 主要是因为西瓜的下列哪个结构中含有大量的糖分[ ]
A.细胞壁
B.细胞膜
C.细胞核
D.液泡
答案:D
做一套衣服需要2种料子,问做100套同样的衣服需要多少种料子 ( )。
A.126
B.2
C.5
D.41
---Little Tom could hardly pass the exam, _________?
---_______. Although he was ill the day before the exam.
A.couldn’t Tom; Yes, he could
B.could he; Yes, he could
C.could he; No, he couldn’t
D.couldn’t he; No, he couldn’t