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问题
单项选择题
根据《工程建设强制条文》要求，在爬模装置顶升时，承载体受力处的混凝土强度必须大于（）MPa，且必须满足设计要求
A.8
B.10
C.11
答案
参考答案：
B
选择题
After walking a long time, she _____ a rest.
A. stopped to have
B. stopped having
C. to stop to have
D. stops having
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选择题
Put some ______ and chicken ______ on the sandwich.
A. lettuce, slice
B. lettuces, slices
C. lettuce, slices
D. lettuces, slice
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