语法选择Directions： Choose the best answer from the four choices marked A, B, C and D.That policy encourages graduates to choose lower-paying careers, ________ reduces the financial return to education.
A. that
B. which
C. and
D. where
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The cross was such an enormous stumbling block ________ we have in it a rather surprising proof of the genuineness of primitive Christianity.
A. so
B. while
C. that
D. which
It is essential that these application forms ________ back as soon as possible.
A. will send
B. sent
C. be sent
D. sends
Thecityhas________ myhometown.
A. twice people as
B. twice as people as
C. twice as many people as
D. people twice
按坐标系统分,工业机器人的主要机械结构有:
A. 直角坐标型
B. 圆柱坐标型
C. 球坐标型
D. 关节坐标型
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