用纸袋将植物未完全开放的花套起来,不久纸袋内结出了果实,说明花的类型是( )
A.虫媒花
B.风媒花
C.单性花
D.两性花
答案:D
读短文,判断正(√)误(×)。
I'm Alice. This is our school. It is big. This is my classroom. It's big and clean. Look! That is my desk. It is yellow. My teacher is Miss Li. She is in the classroom. She is a good teacher. I like my teacher.
( ) 1. My name is Alice,
( ) 2. My school is small.
( ) 3. My classroom is dirty (脏的).
( ) 4. My desk is yellow.
( ) 5. Miss Li is not in the classroom.
下列哪种局面中存在让路船和直航船?()
A.互见中的对遇局面
B.能见度不良相互看不见时的追越
C.互见中的追越局面
D.航向交叉相互驶近的构成碰撞危险的两操纵能力受到限制的船舶