○○☆△○○○☆☆△○○○○☆,接着画的图形应该是[ ]
A.△☆☆
B.☆☆△
C.☆△☆
答案:B
下图是生态系统中某元素循环的模式图,对该图说明不正确的是
A.这是碳元素的循环
B.A 与B 两种生物是生态系统不可缺少的成分
C.①是光合作用,②、③是呼吸作用,④是微生物的分解作用
D.该物质循环带有全球性
—Would you like to go swimming with me this afternoon, Jack?
—______, but I have a lot of work to do. [ ]
A. Yes, let's go.
B. I'd love to.
C. No, I won't.
D. It doesn't matter.