题目

某研究小组在透明的密闭温室里，水稻种子萌发及幼苗发育的研究，实验测得温室中氧气浓度的变化情况如图所示。下列有关说法正确的是（） A . 水稻种子萌发过程中同时存在有氧呼吸和无氧呼吸 B . 从B点开始进行光合作用 C . C点之前鲜重增加主要是O元素增加所致，干重增加主要是C元素增加所致 D . C点之后，限制温室内氧气浓度增加的外界因素主要是CO2 As an autistic(自闭的)teen, Niam Jain doesn't speak much. But ever since the 13?year?old picked up a paintbrush last summer, he's found a way to express himself, and the art world is listening. Niam, who lives in Toronto, was diagnosed(诊断)with autism at the age of two. Niam is in special education class and loves school. Last summer Nina Jain bought her son some art supplies to give him something to do.She never thought it would lead to a passion(酷爱)and a career, but soon after she posted Niam's first paintings online, a lot of people started buying them.Some were from family and friends. But most came from sharp?eyed collectors.Niam has already sold 46 paintings across Canada and the US. He's made nearly $20, 000, and the number keeps growing.“I don't know how he can do this because this is the work of a kind of successful mid?career painter, ” says a gallery owner after he pointed out Niam's mastery(精通)of the technique of mixing and layering(分层堆积)colours.“Since he has paintings and he loves to do what he does, he has a reason to get up in the morning and that's really, really important, ” Nina says.Morning and night, Niam can be found in his studio, sometimes painting for hours at a time, on more than one canvas at a time.For this artist, there's no way of knowing what his next creation will be or what will encourage him next. The future is a canvas for his imagination.1.How old is Niam?A.Two. B.Thirteen.C.Fourteen. D.Fifteen.2.When buying Niam some art supplies last summer, ________.A.Nina wanted Niam to have a career in artB.Nina hoped painting would cure Niam's autismC.Nina thought painting would become Niam's greatest passionD.Nina wanted to find a way for Niam to spend his time3.Which of the following statements is TRUE?A.A large number of people are expecting to buy Niam's paintings.B.Niam posted his first paintings online by himself.C.Niam is still learning to master the technique of mixing and layering colours.D.Niam is unable to paint for several hours at a time.4.The writer thinks that ________.A.Niam is a poor victim of autismB.Niam's story is sadC.Niam is wasting his life on paintingD.Niam's story is inspiring(激励的)and encouraging