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【单选题】
Lifelong learning is made a necessity by the ______.A.
failure of schools to produce qualified students
B.
need for the workers to constantly renew their skills
C.
lack of preparation for work on the part of the students
D.
threat impending unemployment imposes on skilled workers
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A.
5价磷，3价硼
B.
4价碳，3价硼
C.
3价硼，5价磷
D.
3价硼，4价碳
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A.
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B.
一般疑问句
C.
特殊疑问句
D.
选择疑问句
E.
反义疑问句
F.
祈使句
G.
感叹句
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【单选题】岩土工程勘察等级划分为甲、乙、丙三级，不符合可划分为甲级的条件是：
A.
工程重要性为一级
B.
工程重要性为一级（建筑在岩质地基上），场地复杂程度和地基复杂程度等级均为三级
C.
工程重要性、场地复杂程度和地基复杂程度都为一级
D.
场地复杂程度为一级
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