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【单选题】
Debts incurred by someone who is borrowing to finance the purchase of land or buildings, with the asset serving as collateral, are called______.A.
preferred stocks
B.
real estate securities
C.
common stocks
D.
mortgages
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举一反三
【简答题】已知 i ， j 分别是与x轴，y轴正方向相同的单位向量， OB 1 = ai - 6j （a∈R），对任意n， B n B n+1 = 6i +3? 2 n-1 j ． （1）若 OB 1 ⊥ B 2 B 3 ，求a的值； （2）求向量 OB n ．
【单选题】What did he do to make her happy.
A.
He studied much harder.
B.
He often took her for a tide.
C.
He alwaysendured her insults.
D.
He often bought her presents and meals.
【单选题】已知 i 、 j 分别是与x轴、y轴方向相同的单位向量，且 AC =-3 i +6 j ， BC =-6 i +4 j ， BD =- i -6 j ，则一定共线的三点是（ ）
A.
A，B，C
B.
A，B，D
C.
A，C，D
D.
B，C，D
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