【单选题】Các chị là nông dân, chúng tôi là học sinh, không phải là nông dân.
【单选题】下列关于紫外线的说法中,正确的是( )
A.
由于紫外线有杀菌作用,因此人们要多照射紫外线
B.
紫外线具有杀菌作用,但人体只能适量地接受照射
C.
紫外线对人体有害,人们要尽量避免紫外线的照射
D.
虽然紫外线对人体有害,但与人类的生活,健康关系不大
【单选题】Where are the reading rooms located?
A.
They are on the first and second floors.
B.
They are on the first floor.
C.
They are on the second floor.
D.
They are in the white building.
【简答题】阅读理解。 Look at the first picture, where are the children now? They are in the zoo. They are looking at the koalas. The koalas are in a large cage (笼子). Are the koalas walking or jumping (跳跃)? They are ...
【单选题】—_____. —They are in the dresser. [ ]
【单选题】Nếu không tắc đường, Tuấn sẽ đi học( )
【单选题】关于紫外线灭菌下面说法正确的是
A.
紫外线杀菌机制主要是因为它诱导了胸腺嘧啶二聚体的形成,从而干扰了 DNA 的复制。
B.
不同菌体对紫外线的敏感程度不同 , 芽孢最差 。