读一读，连线。

①What do you like doing? ____   A.It's white and yellow.

②Do you like this pear tree? ____ B. Yes, it does.

③What colour is this flower?____    C.Yes, I do.

④Does it have long leaves? ____    D. They need water.

⑤What do the plants need?____    E. I like listening to music.

若式子$\sqrt{x-7}$在实数范围内有意义，则x的取值范围是（　　）

等物质的量的氢气和氧气在标准状况下不相同的是（   ）

种豆得豆种瓜得瓜是因为亲代把（ ）传给了子代．