在国际工程承包中，承包商未经业主同意，不能转包工程的任何部分，但对他所选择的二包商则应()
A. 由承包商自己决定
B. 必须由业主自己指定
C. 必须征得业主的同意
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Who were the main customers of Sears and Wards business？
A. Farmers.
B. City people.
C. Business people.
D. Students.
矿物药中含有()问题使得矿物药的使用一直备受争议—（）
A重金属
B微量元素
C化学成分
D碳酸钙
When was the building being visited constructed？
About twenty years ago.
B. In the sixteenth century.
C. From the late 1800s to the early 1900s.
D. From the late 1600s to the early 1700s.
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