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问题 选择题

下列计算正确的是[ ]

A.（-4x2）（2x2+3x-1）=-8x4-12x2-4x

B.（x+y）（x2+y2）=x3+y3

C.（-4a-1）（4a-1）=1-16a2

D.（x-2y）2=x2-2xy+4y2

答案

C

单项选择题

The core of ______ is language acquisition which is considered a subconscious process, dependent on the amount of input the students get and allow in.

A．The Direct Method

B．The Audiolingual Method

C．The Cognitive Approach

D．The Natural Approach
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填空题

In a Natural Approach class, in the pre-production stage, the teacher provides comprehensible input, maintains focus on the ______ and helps lower affective filters.
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