世界上最大的岛屿是[ ]
A.台湾岛
B.阿拉伯半岛
C.格陵兰岛
D.马达加斯加岛
答案:C
- Have you bought that digital camera?
- No, I can’t afford it. The price is a bit too ________, I think.[ ]
A. low
B. high
C. cheap
D. expensive
生物多样性的物质基础根本是()
A.蛋白质的多样性
B.DNA分子的多样性
C.核酸的多样性
D.核苷酸的多样性