题目

A nice bunch of flowers on the kitchen table can lighten up any cloudy day, don’t you agree? Unfortunately, flowers are pretty expensive, especially when you consider you’ll have to throw them in the bin after a couple of days already. 【1】Everybody loves flowersFlowers are beautiful and they provide your home with a cosy and welcoming atmosphere. 【2】. However, buying plants can be pretty pricey. So growing them yourself in your garden might be a good alternative. It doesn’t just look pretty; it’s also good for your mental health!Green thumb (园艺达人)【3】 Luckily, we’v下图纵轴为酶反应速率，横轴为反应物浓度，其中正确表示酶量增加1倍时，底浓物度和反应速率关系的是 [　　]