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【單選題】
艾滋病病毒屬于RNA病毒，具有逆轉(zhuǎn)錄酶， 如果它的一段RNA含堿基A 23%、C 19%、G 31%，則通過(guò)逆轉(zhuǎn)錄過(guò)程形成的雙鏈DNA中堿基A的比例為
A.
23%
B.
25%
C.
31%
D.
50%
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舉報(bào)參考答案：
舉一反三
【單選題】Why is Ireland also called “Emerald Isle”?
A.
Because the Irish like green very much.
B.
Because there’re many emeralds in the island.
C.
Because the island is covered with green plants.
D.
Because the Irish are green people.
【單選題】It was because of bad weather __________ the football match had to be put off.
A.
so
B.
so that
C.
why
D.
that
【單選題】Clouds are made of
A.
seas, rivers and lakes
B.
blocks of ice
C.
very small drops of water or snow crystals
D.
solid, liquid and gas
【單選題】Water has three states(狀態(tài)). They are
A.
solid, liquid and gas
B.
solid, vapour, snow
C.
drops of water, blocks of ice and crystals of water
D.
ice, snow and air
【單選題】It is said that when you find a shamrock with four leaves, you’ll be____________.
A.
healthy
B.
happy
C.
lucky
D.
rich
相關(guān)題目：
【單選題】Why is Ireland also called “Emerald Isle”?
A.
Because the Irish like green very much.
B.
Because there’re many emeralds in the island.
C.
Because the island is covered with green plants.
D.
Because the Irish are green people.
【單選題】It was because of bad weather __________ the football match had to be put off.
A.
so
B.
so that
C.
why
D.
that
【單選題】Clouds are made of
A.
seas, rivers and lakes
B.
blocks of ice
C.
very small drops of water or snow crystals
D.
solid, liquid and gas
【單選題】Water has three states(狀態(tài)). They are
A.
solid, liquid and gas
B.
solid, vapour, snow
C.
drops of water, blocks of ice and crystals of water
D.
ice, snow and air
【單選題】It is said that when you find a shamrock with four leaves, you’ll be____________.
A.
healthy
B.
happy
C.
lucky
D.
rich
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