皮皮学，免费搜题
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搜题
【单选题】
介导体液免疫的细胞是A.
T细胞
B.
B细胞
C.
巨噬细胞
D.
肥大细胞
E.
NK细胞
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举一反三
【单选题】Why is it important to realize and handle stress in a positive way when it occurs?
A.
It will inevitably increase your blood pressure.
B.
It may cause physical problems if it is prolonged.
C.
It is so harmful as to cause distress.
D.
It is particularly frustrating.
【简答题】Why is it important to have breakfast?
【简答题】螺旋藻的有何营养特点?
【单选题】Why is it important to save energy?
A.
We must leave some fossil fuels for people to use in the future.
B.
It is difficult to convert fossil fuels into energy with modern technology.
C.
We cannot find any more fossil fuels on earth now.
D.
Many people do not have enough money to buy energy today.
【简答题】雅丹地貌以罗布泊、甘肃敦煌月牙泉一鸣沙山、乌尔禾风城等最为典型。（ ）
【单选题】Why is it important to know the entire process before the trip?
A.
It makes sure you have a unexpected trip.
B.
It makes sure you have an exciting trip.
C.
It makes sure you have a pleasant and safe trip.
【简答题】雅丹地貌以罗布泊、甘肃敦煌月牙泉一鸣沙山、乌尔禾风城等最为典型。( )
【单选题】According to Landau, why is it important for a president to have a dog?
A.
It increases his chances of being reelected.
B.
It humanizes the president, making him easier to relate to.
C.
It shows that the president can care for an animal．
D.
It is the tradition of White House as a president．
【简答题】Why is it important?
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