【单选题】Please explain the situation to the( )(列车长) and buy a ticket.
【单选题】Please explain the _____ of this word.
【单选题】— Mr. Martin, would you please explain the grammar rules for participles once again? — All right. That's just______most students may easily get confused.
【单选题】关于感光细胞,说法错误的是
B.
视锥细胞能感受强光的刺激,可辨色,如出现问题则可能会产生红绿色盲
C.
视杆细胞对光敏感性低,不能辨色,出现问题时常常会导致夜盲症
D.
眼底的中央凹处只有视锥细胞,是感光最敏锐的区域
【多选题】下列关于视锥细胞的叙述,哪些是正确的( )
【单选题】Please explain the ___of this word.