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【单选题】
下列等式变形：①若a=b，则 ；②若 ，则a=b；③若4a=7b，则 ；④若 ，则7a=4b．其中一定正确的个数是 [ ]A.
1个
B.
2个
C.
3个
D.
4个
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【简答题】¿No crees que ___ (tener, tú) que hacer todo lo posible para obtener un mejor resultado que ella?
【单选题】¿Cuál es el precio que tuvo que pagar Chang E por la inmortalidad?
A.
La riqueza que había guardado en casa.
B.
Vivir en una soledad interminable.
C.
La muerte de su marido.
D.
【单选题】question 24.mp3:
A.
She was extremely mean with her money.
B.
She was dishonest in business dealings.
C.
She frequently ill-treated her employees.
D.
She abused animals including her pet dog.
【单选题】mp3:
A.
It can change into acids causing damage to their outer covering.
B.
It greatly reduces their resistance to the attacks of bacteria.
C.
It makes their nerves and blood vessels more sensitive to acid food.
D.
It combines with food particles to form a film on their surface.
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