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【简答题】
从以下备选单词中选择合适的单词,并用其恰当形式填空。每空一词 watch, seldom, help, homework, weekday 1. My brother often ______ my father clean his car. 2. After school, my brother usually _______ TV at home. 3. What time do you usually get up on _______? 4. Mary often goes to school by bike. She ______walks to school. 5. Helen always does her ______ after supper.
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举一反三
【单选题】In order to get the first reward, passengers must fly at least ______.
A.
for 6 months
B.
20,000 miles
C.
3,000 miles
D.
once in three weeks
【简答题】In order to get the first reward, passengers must fly at least ________. A) for 6 months B) 20,000 miles C) 3,000 bonus Miles D) once in three weeks
【单选题】利用不同性质有机染料可对细胞中不同成分选择性染色,下列哪种结果有误( )
A.
碘液可使口腔上皮细胞的细胞质和细胞核呈深浅不同的棕黄色
B.
甲基绿可使 RNA 分子呈蓝绿色
C.
苏木精可使细胞内核酸呈蓝色
D.
派洛宁可使 RNA 分子呈红色
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